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It has been a few months since I installed Windows Live OneCare and results are mixed.  For the most part it runs quietly in the background providing, at least I think, real-time protection.  The problem the last few starts has been MsMpEng.exe (Windows Defender) crippling my machine with heavy CPU utilization.  I've Googled, Live- Searched, MS-Knowledge Base searched and found basically the same thing... High CPU... but no resolution.

I dug through OneCare help and still didn't find anything.  Therefore I decided to look in the registry and found: HKLM | One Care Protection | Exclusions.  Under Exclusions I found three folders: Extensions, Paths, and Processes.  I know through the One Care GUI I can designate folders and files for exclusion.  I have excluded a few folders and found these in Paths.  On a whim, I decided to add MsMpEng.exe in Processes.  I was initially blocked lacking permission.  I added full control and then added the DWORD: MsMpEng.exe having a data value of 0.  I restored the permissions and restarted.  After the restart, MsMpEng.exe has not consumed more than 50% CPU at startup (for only a brief time) and then occasionally 7-10% when browsing or starting other applications.  For the most part it runs quietly at 0%  I'm only guessing, but MsMpEng.exe may have been monitoring MsMpEng.exe.  So far so good...

Posted on Monday, March 26, 2007 6:17 PM | Back to top


Comments on this post: MsMpEng.exe is the nugget draining my CPU...

# re: MsMpEng.exe is the nugget draining my CPU...
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I have the same problem. I have thousands of pictures on my PC, and I use the view-by-thumbnail option when retrieving picture files from my folders. MsMpENG was using SO much CPU that the thumbnails would not even render! Watching videos was a nightmare. When OneCare and MsMpENG was disabled, everything worked fine.

I am going to try and use the steps that you outlined above to help resolve this issue.

It seems very strange to me that MS would create a security application that cripples a PC…. Talk about poor design.
Left by Wyatt Brown on May 01, 2007 4:38 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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This does not really surprise me have spent hours on another forum reading all threads about the different variations of Updates from Microsoft and how, knowing the problem, even they can not come up with a fix. But now having at least partially solved that by using Windows update, manually updating office as needed, and never again using Microsoft update I am moving onto the next CPU usage hog MsMpEng.exe so will be trying the exclusion solution mentioned...yeh very poor design (this is in XP Home SP 2) and from what I have heard there is something known and similar in Vista.
Left by R on May 14, 2007 9:27 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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I discovered this problem on my XP pro box when I was trying to gauge how bad a piece of resource-intensive code I wrote was. I was trying to use the Task Manager's CPU usage graph to get a feel for whether or not my code would have any noticeable effect on system performance. I was expecting my code to increase CPU usage by 1 or 2 percent so I had to get the background activity down to zero in order to notice the effects of my code running. Prior to installing Windows Defender, this was never a difficult thing to do. Until I stopped the Windows Defender service, the CPU usage was way over 50% and everything I tried to do on this machine (i.e. browse the web to find out what MsMpEng.exe was) was horribly slow (lots of disk swapping). I had noticed the poor performance and heavy disk swapping for several days and was starting to worry that I had been infected with some kind of nasty virus.

It seems kinda ironic that I installed Windows Defender to try to avoid having any malware or spyware bog my system down.
Left by Ken W on May 15, 2007 3:21 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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MsMpEng not so easy to kill either. Process keeps coming back to life like some zombie. After a few times, kill proc works though.
Left by edvz on Jul 03, 2007 11:31 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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span you indian! you don't even know what you're talking about
Left by kchop on Jul 06, 2007 9:37 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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okay lets please keep this on subject. my cpu is overtaken by this msmpeng.exe. i dont even have windows defender running? will try the given fix and will do more research and report back.
Left by troy512 on Jul 07, 2007 12:06 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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I have been discussing this with Microsoft Supprt. Problem came with the June'07 monthly update of Vista. I first found out that when Flexnet License Manager (for PhotoShop CS3) wants to access the internet, MsMpEng loses control and loops for exactly 300 seconds, before it is killed because of a timer overrun. Same happens when Adobe Update Manager or an unistaller want to do something on the web. Support says "they are working on it".
I turn off OneCare Virus and Spyware scanner before launching any of these programs and switch it back on when finished.
If it is not solved with the August update of Vista, I'm going to throw OneCare off and buy something intelligent like F-secure.
Left by Marco on Jul 12, 2007 12:28 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Hey guys, whats the conclusion? What does the poor old home user do? Where do we find an explanation is plain English step by step procedure to fix kill this crap utility.
Left by apached on Jul 13, 2007 4:16 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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In my limited experience, Msmsgs.exe is just one of a number of MS dlls that have come to attention due to excessive disc activity. Other offenders being msmpEng.exe, wgatray.exe, wgalogon.exe, msmpCmd.exe, svchost.exe etc.
In seaching forums to deal with these annoyances,I have found that users have devised several creative strategies. Renaming, moving, deleting, disablling in the Registry, changing Startup status etc. etc.
It appears there are 2 issues here:
1. Disable and leave the file intact in case it it needed in the future.
2. Delete completely.(Which is not easy, as Access is denied in some instances)
My question is can we come up with Strategy for the home user that is simple to undo and not going to have drastic future implication and make a bad situation worse?
Left by apached on Jul 13, 2007 5:28 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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Yes, I am seeing same issue CPU and memory use, causing mouse to freeze it seems, I disable MsMpEng and mouse pointer is fine.
Left by datpcstore on Jul 20, 2007 11:47 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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what are u talking about apached noob... msmsgs is windows messenger... (the old windows version of msn messenger)
u can kill it with msconfig.exe or delete it..) and svchost is ur internet connect

my prob now is the 2 indows defender processes that are under the 'SYSTEM' (user) in my taskmanager...(taakbeheer in dutch)
... this is my moms pc.. mine is 101% prob free cuz i know how to NOT break everything
Left by colin on Jul 28, 2007 2:51 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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It seems to me that if you not part of the solution your part of the problem. I'll try to follow the 1st posting ang reduce it to people speak.
Left by VirileUnix on Aug 05, 2007 5:33 PM

# re: MsMpEng.exe -> Microsoft OneCare
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I noticed that this process appeared after I installed Windows Defender (on Windows XP SP2). Once in a while, Windows Defender wants to do a "quick scan" of my computer (which takes about 10 minutes) and the computer is completely unuseable for those 10 minutes.

When I found this forum:
http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=1485433&SiteID=2
I found that my problem is that I have McAffee Antivirus + Microsoft Defender running in parallel and competing for resources.
According to that forum, if I have an antivirus program, I should not use WindowsOneCare (Windows Defender is one component that is available for Windows XP).

Average User: do you trust Microsoft One Care with the "care" of your PC?
YES) Remove your antivirus software as it is redundant
NO) Remove all traces of Microsoft One Care (in my case, only Windows Defender)
Left by doe on Aug 23, 2007 12:36 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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It's definitely tied to Windows Defender and it happens after you leave your system idle for a while.

The quick fix if you don't want to go through all the steps, etc. is to open Task Manager and under the processes tab select the msmpeng.exe line (If you can catch it) and End Process.

That will clear it free and another session of msmpeng.exe will start up but you will free up the processor so you don't have to restart right then.
Left by NMiller on Aug 23, 2007 12:20 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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hey guys.. im stuck... got no idea to how to make this thing stop eating my CPU!!
yes yes i may be a dumb blonde but me and computers aren't really good friends... but i do know MsMpEng.exe is killing my pc..
i end the process in the task manager.. but it keeps coming back n i want it gone for good!!

can someone explain this to me in noob terms please???

thanks :)
Left by noob on Sep 04, 2007 9:34 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Was getting this problem both on my desktop and laptop (both XP SP2). Applied the following change to both and haven't had the problem since.

Run Windows Defender from the start menu. Click on Tools then Options. Scroll down to Advanced Options. Where is says "Do not scan these files or locations" click on the Add button. Browse to the folder where Windows Defender is installed (c:\program files\windows installer) and click OK. The path c:\program files\windows installer should now be shown in the field. Click on the Save button. Thats it.
Left by phil on Sep 05, 2007 10:48 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Mistake in my previous post ... the path should be :

c:\program files\windows defender
Left by phil on Sep 06, 2007 4:53 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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phil - you're the man! This problem's been bugging me for a while. Finally took the time to investigate traced it to MsMpEng.exe, then saw your post here. First after opening Windows Defender, I found it was in the middle of a scan, so stopped the scan, then followed your directions - instant relief!
Left by kelwhi on Sep 20, 2007 12:55 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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alright every one this is one big problem every one seems to have with windows live onecare... for my part i like testing out new programs... just go into your into your control panel and and remove programs and get rid of it... for one thing it never catches most of the viruses like it should... i build viruses and it never catches them ever... as for the windows defender i got that on my pc but sometimes the MsMpEng.exe keeps sometimes going up the msmpegn is a microsoft maping engin for the live one care and the defender which is a basic operation to run in ur back ground to gard u against possible attacts from viruses or any harmfull things.. it ends up going crazy cuz it has no idea what to do... i say get rid of them .. if u want a good program look for a program called trojan hunter that program is one kick ass programs and it deleted some of my virsus i made i was sad of course but glad it works... this is mentioned for newiebees and good for experiance users... now remember no antivirus is giogn to get every thing ... soo always have a back up... like a partition and for those of u that don't know wha that is its just basicaly splits ur hard drive soo virsuses wont affect ur data and u can format the part that is infected... theres no really good protection i say dont go into bad sites u know u shouldnt be giong into in the first place and get rid of that gay asss live onecare its a pice of crap... get ur self trojan hunter it gets what mechafee and norton and pc antiviurs dont get... i fix computers all the time soo i come acrrosss this all the time just saw this post this is the right way if u want ur pc to f up then its up to u to do as u wish its ur pc
Left by Jay aka something else on Sep 22, 2007 4:47 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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and sorry for my bad grammer just noticed it. well like i said if u didnt understand me, get rid of windows live one care and windows defender, in your add and remove porgrams ... you simply go into ur control panel and well add and remove programs ..... doing this will stop that MsMpEng.exe from running your cpu soo high... Windows live one care and windows defender dont do as they supose to any ways



go with torjan hunter its the best better then any anti viruse program i tested soo far,,, avg is crap, reg mechanic is crap to go with regvac it actually does what its supose to
Left by Jay aka something else on Sep 22, 2007 4:54 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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I came upon this little nugget via the MS knowledge base. The resource will spike during a scan, but the scan appears to go a little faster? My laptop went through a normal scan approx. five to ten minutes after booting. The scan lasted under five minutes spiking at times but never over 50% CPU.

http://support.microsoft.com/kb/892489
Left by Coleman on Sep 23, 2007 9:12 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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People get a clue....UNINSTALL One Care it is defective. Bill Gates is a liar and a criminal. That process is in place to kill your PC so you have to buy a new one (with vista)....

ANY free AV is just as good at detecting malware as ANY paid for AV

I suggest you use AVG free edition
Left by Bill Gates on Oct 12, 2007 1:51 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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avg is crap!!!! please stay as far away from that garbage as possible!!!! it is nothing but pure crap and is the biggest scam cause it never ever works!!!1!!!!!
Left by aqgsdahs on Oct 15, 2007 3:33 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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I installed Windows defender about 3 days ago, and told it to do a full scan........I think it scanned every pc in my town!!!......it started at 10pm.........when I got up at 6am it was still scanning !....I mean, what a joke......left it going all day, came home that evening and it had finished and found some stuff, so told it to do its thing..........and that took hours!!!.........couldn't do anything on pc meanwhile either, so, in the end shut the damn thing down.
Rebooted this eve, and MsMpEng.exe was hogging the limelight again...........so killed it.......might uninstall the damn thing altogether......
Left by Mousematt on Oct 16, 2007 2:09 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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people when proses uses 50% of cpu and newer more that means you have 2+ core CPU, and that process uses 100% of 1 of the cores . witch is very bad, in single core CPU your would be dead in the water
Left by user34 on Oct 21, 2007 11:07 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Ive been using Windows Defender (and more recently OneCare) since it was available in Ireland and its the ONLY software of its kind that i have found in 10 years that runs quietly and DOESNT hog CPU. I have never had the problem that is listed above. I have to wonder why this seems to happen to some people and not others? I think OneCare is an excellent piece of software, as was Defender. I have tried AVG and all the other usual recommendations and found them all to be crap.

Just thought i would mention that, its always good to have both sides of the story...

RH
Left by RH on Oct 24, 2007 1:49 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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AM RH
You're an idiot
Left by G on Oct 27, 2007 8:10 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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You're a fking idiot.


****
People get a clue....UNINSTALL One Care it is defective. Bill Gates is a liar and a criminal. That process is in place to kill your PC so you have to buy a new one (with vista)....

ANY free AV is just as good at detecting malware as ANY paid for AV

I suggest you use AVG free edition
****
Left by SBurton on Oct 30, 2007 11:20 PM

# SUCKS for advanced users
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Windows Live OneCare is probably great for users who browse the internet a bit and check their e-mail. However, if you do any kind of "advanced" stuff with a computer, you're pretty much screwed.

When I try to FTP with Dreamweaver, MsMpEng locks it up and the connection times out.

Visual Studio Web Developer sets up temporary web servers so that you can test your ASP.NET code on your local machine...and even though it's a Microsoft product and virus free code, MsMpEng locks it up and it takes about 3-5 minutes for a page to load if it ever does.

I was actualy browsing live.com today, which you'd think that OneCare would give it's own website some measure of trust...but no...it locked up my browser while trying to browse live.com to find a solution to this problem.

The ONLY solution that I've found is to go into Windows Live OneCare, click "Change OneCare Settings", then click on the "Viruses and Spyware" tab and turn "Virus and spyware monitoring" OFF.

If you do this, however, that means that it won't find a virus unless/until you do a virus scan of your computer, which can often be too late. So, I pretty much leave that window open and toggle it on/off as needed.

For the most part, if you're not going to untrustworthy sites or openingup e-mail attachments, then you are safe from the vast majority of viruses...but it's still not ideal to have to turn monitoring off.

Personally, Norton is the only virus software that I've never had problems with...well, I've had problems, but nothing as major as this.
Left by CAL123456 on Oct 31, 2007 1:23 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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How do you uninstall Defender... i see it in my add/remove programs list, but there is no remove button.

furthermore, it doesnt exist in my start menu
Left by Dave on Nov 01, 2007 3:50 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Use NOD32... I've tried pretty much everything on quite a few different PCs and OSes. Nothing I've found works better or more stealthily...barely know it's there. Norton is a resource hogging piece of junk. AVG is well, average (lol). McAffee is the McDonalds version of Anti-Virus... Just my opinion, but if you haven't tried NOD, your missing out... and no, it doesn't have anything to do with Command & Conquer.

Left by Billy Joe Jim Bob on Nov 01, 2007 8:01 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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I agree with ALL the negative comments about Defender! It drains and squeezes the life out of my old pc. I just bought NOD32, and can't wait to get rid of the LIFE-SUCKING NORTON VIRUS SCAM!!! Ya, I mean SCAM!!!!!
Charley-Dallas
Left by Charley-Dallas on Dec 04, 2007 9:22 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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don't know much about NOD, AVG and all the other crap you guys seem to be ranting about. I also don't know how good onecare is for catchin stuff... BUT I do know that if MsMpEng.exe is hogging CPU and you're running OneCare, its the "performance plus tune-up" running. this is the total system scan that it will try to run as often as you've set it up as per your OneCare settings... You can manually stop the "tune-up" from the main screen. ...but if you want to use the brut force and ignorance method... go ahead and uninstall. just keep in mind that all these scanners have to hog CPU at some time to actually check your system...
Left by jjjj on Dec 06, 2007 7:59 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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My next computer is going to be Apple, sick to the teeth with MicroSoft. svhost and msmpeng have my machine working like an old clapped-out steam engine. Maybe it's a ploy by MS to force everyone to upgrade their Windows, talk of monopoly. I trade currencies and I need split second decisions sometimes, and just can't make them.
Left by Patty on Dec 12, 2007 6:46 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Patty, why don't you just download Freespire and install it. It's a easy to use version of Linux that will do anything Apple will for free??

The web page designer of this website is a M$ idiot too. Firefox is highly recommended for this affliction.
Left by Joe on Dec 15, 2007 4:03 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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are you guys sure that it isn't just starting a scheduled full system scan? you can change it in the preferences. I just noticed the process, stopped the scan and it seems fine now.
Left by norm on Dec 18, 2007 1:07 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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how do you get windows defender program up from the onecare?

plus i dont want to get rid of onecare i just spent 40 pounds on it!
Left by goggs on Dec 18, 2007 5:16 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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my solution was to run services.msc and then disable the windows defender service. No problems anymore
Left by bob on Dec 20, 2007 1:39 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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I have come to the conclusion that Windows Defender is crap. Back in the day, it was OK as it did find and remove some harmful stuff, now, it just sucks out loud.
I've been fighting this software for a week now and, to be honest, I'm over it. I just removed it and my PC is fine now. I'll just have to use one of the ten million other anti-malware programs available.
If you bought One Care, I would try to get your money back. Or, at the very least, get your money's worth of tech support to get the issues resolved. Keep their tech on the phone for a few hours until they get it right.

Left by Gophergutz on Dec 20, 2007 10:50 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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PS

For St. Elsewhere et al see for instance:
http://www.computerhaven.info/forum/printable.aspx?m=37712

which is actually helpful without posts by idiots about alleged idiots.

Moved on!

Left by just passing by & moving on! on Dec 23, 2007 12:14 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Having not reviewed this thread closely until some time off, I see it has taken a turn for the worse. Certain inappropriate comments submited by others have been removed. I did check out the link provided by "just passing by and moving on!" and it didn't seem to provide a lot of guidence. If you would like to obtain nuggets straight from the source, I suggest you check out the Windows Live OneCare Forum at: http://forums.microsoft.com/windowsonecare/default.aspx?siteid=2 for additional help. I have upgraded to version 2.0 lately and haven't run into any problems. I've used Norton and McAffee in the past with the same result. As time goes on, software upgrades continue... the hardware doesn't keep up. As you may have guessed it... this tends to drive the market!!!

This thread will continue to be open for helpful comments. As with everything, a few usually ruin it for the many.
Left by COLEMAN on Dec 25, 2007 10:11 AM

# The Solution - possibly
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Go to this website and click on the link that says

Click to run a free scan for msmpeng.exe related errors.

Download this program and run it to fix your registry.

Might help
Left by Ben on Jan 09, 2008 1:17 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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If you guys install the FREE "Process lasso" you will see THE SOLUTION. Automatically lowered process priority!!
Left by Vl on Jan 12, 2008 6:06 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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If you are having problems with Defender, it's likely that you downloaded the wrong version. From what I learned tonight in class, if you don't install the correct version, you'll run into problems with it overloading your system.
Left by Chris on Jan 14, 2008 10:52 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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I have vista sitting here with all of the MS virus stuff installed on it. The comments here are mostly all correct. virus and spyware "monitoring" is looking at *every* packet coming into the machine thru the network connection. So this means that FTP, Sockets, etc. based applications will go Real Slow and web pages, etc. won't appear to be held up that much. So the advice to turn off virus and spyware scanning while running apps that do a lot of TCP/IP stuff and write to the disk continuously is good advice.
Virus identification is remarkably difficult to do so no wonder that we all hate Norton, McAfee, LiveOneCare, etc.
I agree that Norton is probably the least of all of the evils.
Left by chris ruff on Jan 15, 2008 10:55 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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MsMpEng.exe FIXED HERE.

I recieved these instructions from One Care Live. I told them I was not renewing with them unless they had a fix. On the phone the lady told me it was NORMAL for MsMpEng.exe to use 80% CPU. She also told me any other security will not solve the proble. I am a newbee so I just told her I will take my chances with someone else. I was going to try the Trojan Hunter as advised from someone in this thread when I recieved an email from the lady on the phone with the folowing instructions

Kindly try this troubleshooting step:

1. Go to your control panel and open add/remove programs
2. On the left pane, click on add/remove windows components
3. Make sure that there's a check mark on NETWORK
4. After clicking Network click on details
5. Uncheck the box for Peer to Peer then click on next
6. If it ask you to insert the disk, disregard it and just click cancel

I now longer have any problem with MsMpeng.exe. Maybe my computer is not as secure, but at least my CPU is making me $ instead of frustrations. Please let me know if this is what youve been looking for or just the same as turning of your security.
Left by Peter G on Jan 18, 2008 6:02 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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The problem is Windows defender is doing a scan, the simple solution it to open Windows defender and click stop scan. i hope this information helps you.
Left by Gavin on Jan 20, 2008 9:26 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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I agree with VI. I installed Process Lasso and in the first instant it lowered something called MsMpEng.exe to 'below normal' priority. That is how I got here, I was trying to figure what it was and did I get a revelation. Now everything seems to run orders of magnitude faster.
Left by Oldhawkeye on Jan 21, 2008 4:16 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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i keep trying to kill off MsMPEng.exe, and of course it restarts. I've been scrolling through the comments above.

1-I've tried to kick it out of startup, but it returns each time. grr.

2-how the heck to i disable something in a "registry"?

3-i installed LiveOneCare and it removed WindowsDefender for me, so i can't even run that in the start menu.

4-the guy above who says to use the add/remove network and peer-to-peer stuff... i followed your options and i did have a check next to network, and no check next to peer, and it never gave me an option for "next". so that fix doesnt work for me.

5-I keep getting this expired anti-virus warning box in red popping up in the right corner. it freezes my programs and when this happens, and i thought i deleted the program running it, but i guess not. i can't find it in add/remove.


Any more suggestions?!
--allen
Left by allen wendell on Jan 22, 2008 5:06 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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Hi there!... this problem is ocurring in Xp Home Edition Sp2... but I did experienced when I have instaled microsoft LiveCare.. and not with windows defender!!! because windows defender was deleted by me ante instal LIVE CARE. And they wanth a reasonable price/year to have this in you're computer... a thing that is not working . You can download an trojan an instalit to youre computer and you don't experience suck of problem.... like with this MSMpEng.exe from LiveCare!. I believe that I will unninstal this and reinstal my old antivirus and spyware and internet cleaner and hijack! 3 programs but for me work.. and with windows defender!
Left by nsm_route_66 on Jan 23, 2008 2:57 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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This is what worked for me. My problem was high cpu usage (about an average of 60%) after updating to Live Onecare 2.0
After reading a few recommendation on Web forums this is what worked for me even after a reboot.
I have windows XP. Go to:
Control Panel/administrative tools/services
Right click on "peer networking identity manager" ... Then
(select to "stop" the service & take the "disable" options and the select apply and OK).

after a few seconds you will see cpu usage going back to normal.



Left by Alex V on Jan 23, 2008 10:54 AM

# Stopping Defender the "right" way
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I am VERY thankful for the comments. I'd been trying to resolve this for a full week, because I was trying to install ACDSee 10, which just WOULDN'T. I thought my hard drive was going bad, so I tried EVERYTHING (even the almost useless System Restore, backups, playing with the Profiles). A full week wasted! My computer expert made his typical comment: reinstall windows. NAH! After seeing your comments identifying MsMpEng.exe, I left Defender installed, went into its settings and turned them all OFF. Not only do I have ACDSee installed, but my computer is running nice & smooth! Thanks!
Left by claybear on Feb 07, 2008 5:18 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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Thanks for the help. I have been bugged by system stalls for 6 months. Found msmpeng.exe in task manager and figured it may be the problem. Google sent me here. I uninstalled Windows Defender and everything looks good.

I didn't even know it was still running. I had installed it a while ago, tried it, wasn't impressed and took it out of my startup. Evidently it uses register settings to start running every time you reboot.

I really hate software that does that, it is even worse than software like RealPlayer, Quicktime and Adobe Reader that drop in a startup on reboot command whenever you run them.
Left by benj on Feb 11, 2008 1:05 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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I think this program, "MsMpEng.exe," is actually downloading information from "my" computer and I've disabled it. We've entered a technological POLICE STATE. Where is Osama Bin Landen??? We're losing our liberties, people are getting tasered, new gadgets are already developed that are much worse than the taser and WHY SHOULD ANYBODY THINK THAT THE PROGRAMS THEY DOWNLOAD FROM SO-CALLED RELIABLE TRUSTABLE SOURCES ARE REALLY ALL OUR GOOD HELPING FRIENDS?!!!!
Left by Senyor Flexible on Feb 19, 2008 12:16 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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hey i just had this problem, i just used 'uniblue speed up my pc' software, fixit instantly. u get a free copy from www.torrentz.com
Left by webby on Feb 20, 2008 11:59 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Odds are that when MsMpEng is taking up your CPU, that Windows Defender is running a system scan. When your CPU is being hogged by it, open up Windows Defender (Try Start-Programs and look for Windows Defender). When you open it, it will tell you if it is currently doing a scan. Defender runs scans on a schedule--see Tools->Options, and maybe change it to scan at a time when you're not using the PC, and perhaps reduce the frequency of the scans. (Note: the Tools->Options are not available while a scan is being run--you'd have to stop the scan first.) Of course, the less frequently you run the scan, the less protected you are from the malicious software that Defender is designed to protect you from.
Left by Ed on Feb 27, 2008 2:59 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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I just accomplished the steps explained by phil who posted above on 9/5/2007. It was simple and more importantly, it got my defender's scan down to 4 minutes without every going above 30 percent CPU usage. Thanks phil!!
Left by FreeAtLast on Feb 29, 2008 9:34 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Clocked over 10 hours of phone support from MS! Yup...Defender is the hog. Thanks guys. What is the best antivirus system out there for XP serv pk 2? (Currently I have One Care)
Left by Deb on Feb 29, 2008 12:29 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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I just went into windows defender and excluded all my drives from being scanned and set the scan time to 0300. probably redundant but seems to have worked.
Left by captainnice on Mar 03, 2008 12:44 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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I went to Window Defender on my desktop list of programs, clicked on it, clicked on options and unchecked everything.
I then got a message that Windows Defender is turned off and I should be careful - hah!
I just did this so am not sure it won't come back after a restart but, if it does, I will remove it altogether per some of the suggestions above. If it doesn't come back, this solution would seem to be the simplest and the program is still there if I ever want to use it again.
Left by Fred on Mar 09, 2008 6:08 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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I went to Window Defender on my desktop list of programs, clicked on it, clicked on options and unchecked everything.
I then got a message that Windows Defender is turned off and I should be careful - hah!
I just did this so am not sure it won't come back after a restart but, if it does, I will remove it altogether per some of the suggestions above. If it doesnt come back, this solution would seem to be the simplest and the program is still there if I ever want to use it again.
Left by Fred on Mar 09, 2008 6:09 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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I went to Window Defender on my desktop list of programs, clicked on it, clicked on options and unchecked everything.
I then got a message that Windows Defender is turned off and I should be careful - hah!
I just did this so am not sure it won't come back after a restart but, if it does, I will remove it altogether per some of the suggestions above. If it doesnt come back, this solution would seem to be the simplest and the program is still there if I ever want to use it again.
I use Kaspersky suite which does a good job and does not hog the CPU like McAfee and Norton.
Left by Fred on Mar 09, 2008 6:11 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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I went to Window Defender on my desktop list of programs, clicked on it, clicked on options and unchecked everything.
I then got a message that Windows Defender is turned off and I should be careful. I dont think so.
I just did this so am not sure it won't come back after a restart but, if it does, I will remove it altogether per some of the suggestions above. If it doesnt come back, this solution would seem to be the simplest and the program is still there if I ever want to use it again.
I use Kaspersky suite which does a good job and does not hog the CPU like McAfee and Norton.
Left by Fred on Mar 09, 2008 6:12 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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I just got slowed down by msmpeng.exp. It just showed up when I got an adobe upgrade notice, just like Marco memtioned inhis 7/12/2007 12:28 AM post. I dumped the request and it let go of my CPU.
Left by Wiskeysour on Mar 11, 2008 11:43 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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I always check Task Manager when CPU runs hard, and found same problem today: with MsMpEng.exe. Came back later and now running fine, so it could have just been scanning. I also had just installed OneCare a week ago, and uninstalled my McAfee (which also was a CPU hog). So after reading all of these posts, I have followed Phil's from 9/5&6/07, and similar to "S" 3/4/08. I have figured out that since I have One Care, I do NOT have Windows Defender... same MsMpEng.exe file, just different named folder, so follow whichever one you have. For current version of OnceCare, open it, under Quick Links, click on Change Settings, Click on Viruses and Spyware, click Exclusions button, click Add Folder, and navigate to C:\Program Files\MicrosoftWindows OneCare Live\Antivirus and click OK. But I think I will also try Process Lasso just for grins as this type of CPU problem drives me nuts!
Left by MKF on Mar 15, 2008 3:00 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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phil, thanks for your lifesaving instructions! Ah, the silence now that my hd isn't running constantly.

Left by mane on Mar 16, 2008 2:52 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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everytime I hear it running it rarely shows in the system tray but find it is defender running a normal system scan. just go to controle pannel click on software explorers and if it is running you will see it and just stop the scan. change your settings as to when and how often you want it to run
Left by easy solution ( I think) on Mar 18, 2008 1:37 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Great...Great..Phil.
You are really The Saver!
Your suggestion was brilliant.

Good Luck Everybody.
Left by Friendly on Mar 20, 2008 1:19 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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inf my experience i had a problem with spoolsv.exe eating 99% CPU , every time i killed the process MsMpEng.exe started to suck up 95% of my CPU. i found the root of my spoolsv.exe problem and so far MsMpEng.exe hasnt botherd me yet :D
Left by inferno on Mar 26, 2008 1:10 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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I deleted Windows Defender....issue resolved....
Left by pokerdebs on Mar 27, 2008 10:30 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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I have SolidWorks 2008, and msmpeng.exe starts up Solidworks every time it scans it for some reason.
Left by Brian on Mar 29, 2008 1:17 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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I have defender running on 3 old P3 computers with as little as 256Mb of Ram and the systems work great... I have been using Windows defender since it was first released in Beta form and never had an issue.

I run it on both my P4 computers and no Problems!

I think the issue here is Windows One Care and not the Standalone Product Windows Defender...

Let the flaming begin... :)
Left by 4hams on Mar 30, 2008 7:22 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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4hams, you are just wrong. I have only installed Windows Defender and I suffer from this issue, so it is not Windows One Care. It's Windows Defender.
Left by wtff on Apr 02, 2008 3:20 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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Yes, it is Windows Defender. It uses about 30 MB of memory -- one of the top Windows memory hogs. You have two options:
1. Set Windows Defender service to start 'manually' instead of 'automatically', using Windows Administrative Services tool. Then start it (with the same Services tool) whenever you want to run it, and stop it when you're through with it (using either the Services tool or the CtlAltDel Task Manager to end the MsMpEng.exe process).
2. Uninstall it and don't use it! Use AdAware and or Spybot.

This is typical of Microsoft -- users have to resort to third-party web sites, blogs, and technical articles for solutions that Microsoft ignores.
Left by Ken Kuhns on Apr 12, 2008 11:46 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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Everyone in this forum knows that there is a serious problem with MsMpEng.exe, however no one can offer a solution that works. If you are reading the entries in this forum, you are wasting your time. The entire forum should be deleted and replaced with a link to an article that offers a true solution.
Left by Brad on Apr 15, 2008 12:08 PM

# Simple Solution
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MsMpEng.exe is the background scanning option for LiveOne Care. By ending the process you are cancelling the background virus scan. Simply change your scan settings or manually run the scan prior to shutting down the machine. It will only run when scheduled OR after the first boot/wake after a missed scan.
This one is very simple guys!
Left by Justin on Apr 20, 2008 3:47 PM

# re: Simple Solution
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It's not that simple as far as I can tell. There is no way to prevent the scheduling of the background virus scan which eats up the CPU. When you say "simply change your scan settings" I think you mean to change the settings so that you reduce the scan frequency to once/week (which is an improvement, I admit). There is no option in OneCare to turn it off altogether, unless I'm missing something.
Left by Brad on Apr 23, 2008 10:37 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Actually MsMpEng.exe will not be deleted/stopped by uninstalling 1 Live Care, of Windows Defender. It is a system service (not that it is doing any service for my computer) that scans your entire computer if you haven't done so recently (or it hasn't done a scheduled check in a long time), whether you have WD, 1LC. Also it will still do this even if you have scanned it with something else that is not exclusively Microsoft.
Left by Jonathan on Apr 25, 2008 9:37 PM

# re: yay 3/4/2008 5:08 PM s
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these steps kind of worked.

MsMpEng didn't stop running, but the CPU usage did drop down to 0%.

i have a decent dual-core (AMD athlon X2 3800+ 3 yrs old) with 2 GB ram, so the CPU usage didn't bug me much, it was the disk use. like i said, my pc is 3 years old, so i don't like it when my hard drive is running at full speed cuz 1c is running stuff in the background making my HD click a bunch of times.

i'll be back later to let ya know if it's still a good fix =)


***i couldnt find any traces of windows defender on my comp for some reason. but i solved it another way
steps:
alt+cntrl+delete opens task manger
click processes tab
find msmpeng.exe
right click and click end
onecare icon will turn red
then click on it
click change settings on the left side
click viruses and spyware tab
click exclusions
add this folder: c:/program files/microsoft windows onecare live
done! ***
Left by Yellow_shoe on Apr 26, 2008 4:19 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Ok guys, hang in there. I've been testing windows defender on my laptop which runs XP. Windows Defender was doing fine until the latest update to SP3 was installed. Then I got a new update for Defender, and it wouldn't install.

Looked on the internet to find out what MsMpEng.exe was because I noticed the problem while trying to play a game. Now don't get mad, but I just un-installed it and Yeah, no more hang ups.

As far as anti virus goes, I've made a ton of money cleaning other peoples computers free of viruses with Avast. They have a free home user version that works like a charm! I have purchased the Pro version going on 5 years now since it saved me from about.blank. Found it on MajorGeeks.com and haven't had the need to even look at any other protection. They have a great Bootscan that runs prior to startup to check processes before they start. Plus they recreate DLL files that have been damaged by viruses. Can you ask for anything more? Oh you can... it has a virus database generator that sends anything suspicious back to the company and I've actually seen an update within hours of sending the info.

As far as AVG goes, it's great if you are running Linux based systems, (my brother is a Linux Guru, so he says and swears by it) even Mac, but with MS it's hell on the CPU. It hangs up everything when it starts an update and it can take forever if you are on dial-up. Personally, I've never had it on any of my computers, but I've had to clean up quite a few that had it. Which maybe the proof in the pudding that it doesn't work all that well. Norton and McAfee, you are just wasting your money. If you want to spend money on a program to protect your computer, buy the Pro version of Avast. The more you buy the cheaper it is. I believe 10+ licenses makes the total for a 3 year pro version around $43.00 per license. Not per year, but for the entire 3 year period.

Like I said in the beginning, I was testing Defender and well, it failed. Another reason why I'm sticking with XP for at least another 3 years. I personally don't like the new look of vista as it appears to me to have been dumbed down. I was a hold out on XP SP2 as well. Waited until the bugs got fixed after installing it and un installing it, before re-installing it. I guess I should have been a bit more careful with SP3, but hey, sometimes you just have to jump in with your boot on!

By the way, stopping process in Task Menu can be risky and if you stop the wrong svchost as it could cause more problems than you think. Just un install Defender or OneCare and save yourself the hassle. It took me longer to type this then it did to fix the problem. Lesson learned!
1centwiz
Left by 1centwiz on May 10, 2008 4:31 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Another user that used Phil's fix above. My system has never been so quiet! Thanks Phil!
Left by aw on May 27, 2008 9:31 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Yes, whoever you are Phil, (posts of 9/5/2007 and 9/6/2007[, you have made many people's life better. I love the silence when my machine is not churning. Thank you.
Left by Jack on May 28, 2008 1:10 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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I was about ready to give up on OneCare because of MsMpEng.exe (XP). I was forced into a situation after killing MsMpEng that prevented One care from restarting at boot-up.

Ended up doing a uninstall and reinstall of OneCare and my computer is running smoother than it has in months. I don't see the hard drive flashing even long after MsMpEng has finished at startup and I.E. windows are smoother. If you are having problems at start-up perhaps a uninstall and reinstall may help. My 2 cents of experience.
Left by Blair on May 30, 2008 1:18 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Ditto, I was for sure I had a hi-jacking. My disk are going like crazy. I am not even using the internet. The CPU is not getting anything done. I jump into Task Manager. Yes, indeed something called MsMpEng.exe is working away like crazy. I unplug my internet connection. Let me hunt down this program's exe and report it to others as a new problem. What an internet search shows it is tied to One Care. Cripe, I put that stuff on because I was tired of all the system crashed and incompatibility issues of our software writers. Jeepers, I am a teacher. We are so not using the software and capabilities of the tech stuff. The use of this computer technology in the classroom world is minuscule in huge part because of unreliability because in reality when one actually attempts to deploy it in the class situation one has to "throw in the towel" because operation failure plagues you every step of the way when it comes time to scaling things up and rolling them out the biggest problem, the biggest obstacle to good practical and effective use and development is incompatibility. That is why I gave up using what seem to be the best tools and decided to stick with Microsoft's generic including protection. I wish to use optical character recognition, voice commands, dictionary programs, readers programs, and interactive data bases but I can't even get the DVD and CD readers and writers to get along every step along the way I have been plagued and find that the systems crashed my programs frequently because of incompatibility issues. Incompatibility is issue number one. Hardware failures is a distant second. The standards and open coding concepts are a must if we are to get functionality and practical systemic use out of this stuff. Those that want to trap us into dependence with them and to patronize us do us no favor. This is not OK ... Tell me in practical developmental terms how can you tell the good guys from the bad guys.... ****
Left by Glen W. Crough on May 30, 2008 6:00 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Hi there, an old Pentium4@ 1.6GHz here running Norton 2007 (NAV) autoprotect enabled to run in the background and same with Windows Defender (WD) - Version 1.1.1593.0. "CPU Usage" is at 5% - hold on, just dropped to 4%, wait - its on 3% now... OK, shes relatively stable and fast enough to play HL2 @ 20FPS (Geforce4 TI 4600). Just starting a WD scan now... hmm CPU is at 75-80% and the computer is less responsive - just a little though. Suggestion - dont run scans -> NAV or WD while you are trying to do anything, unless you have a Quadcore running @ 4GHz and a 9000 series NV GPU. Task manager reports that MsMpEng.exe has locked 32MB of memory, but I have 786MB's to play with, so no problem. Whats all the fussing and complaining about?
Left by xyb0rx on Jun 08, 2008 6:10 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Windows defender is driving me creazy even on stop it uses CPU like hell.
So I went to windows services and change the automatic option of win defender to "disable".

On my Xp, for years I have been using Kasperski Web protection without failure along with spy doctor.
Left by Geo Bontemps on Jun 17, 2008 7:48 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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Phil your the MAN!... Thats the real GRAVY there!

In addition I...

1. Set Defender to Quick Scan ONLY... went from 79156 hours to about 10 minutes.

2. Defender is a Firewall... If you have another firewall Norton McAfee etc... allow the settings to be changed so that the firewall is managed by the Anti-virus program.

3. Scan should be done at night 12am - 5am... you know sleep time.

4. Restart to check
Left by Ron on Jun 19, 2008 10:41 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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I just went to control panel and add/remove programs. removed the yahoo browsing and anti-virus components. its all trash anyway; i use a public computer and have to deal with this occasionally.
Left by dong on Jun 22, 2008 8:40 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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MsMpEng has my system so fucked up I can't even log in to get the shit uninstalled.

On the unlikely even I do manage to log in, it locks up the system 2 mins in

I can't find the windows defender folder in programs but msmpeng keeps running and if i stop it it starts right up again

HELP
Left by Bill on Jul 04, 2008 5:55 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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I do not even have Win Defender and it is still there.
Left by meq on Jul 25, 2008 11:59 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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If you really want to stop Windows Defender do this.
Start... Run.. then type: services.msc
Go down to WIndows defender, double click and disable. Click Apply & OK. Then go to File and Exit.
Left by Alan on Jul 31, 2008 10:08 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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Problemis easy to solve, ditch windows and install Linux
Left by bill hater on Aug 09, 2008 1:22 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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control panel -> administrative tools -> Services -> sort by status -> right click stop then you can click properties and set the startup type to whatever you want

i think its a background service that scans your hard drive without your permission
Left by Sean on Aug 12, 2008 6:22 AM

# disable windows defender service
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the service is called Windows Defender, forgot to mention that in the above post, fix works for my xp machine


control panel -> administrative tools -> Services -> sort by status -> right click stop then you can click properties and set the startup type to whatever you want
Left by Sean on Aug 12, 2008 6:27 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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TO SUM UP MAIN POINTS

1. Avast (free) antivirus does everything - firewall, antispyware, etc THAT'S ALL YOU NEED. Don't bother with defender and Norton is awful.

2.If you want to keep it. Set Windows Defender service to start 'manually' instead of 'automatically', using Windows Administrative Services tool, as directly above, or similar.

3. My copy deleted from the Add/Remove programmes feature accessed via control panel in the start menu.
Left by Britney on Aug 24, 2008 11:42 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Hey i had the same problem, one care was running a scan on my machine without my knolage so i closed the scan and the cpu went back to 0-4% hope this helps :)
Left by L4gdar on Sep 10, 2008 4:02 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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Read Phil's Comments worked like a charm!
Left by Jordan on Sep 22, 2008 12:36 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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I started having problems with this MsMpEng.exe about 2-4 weeks ago I've never had a problem with this before, it just stared out of the blue. Very weird but i finally decided I had had it with this. When i was trying to watch movies on winamp and my sound kept on "jumping" and I pulled up task manager (i keep it on the bottom of my screeen at all times it really comes in handy) and 9/5/2007 10:48 AM phil hit it right on the head I did it and now winamp works perfectly
Left by buss man on Sep 26, 2008 7:49 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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If you want to vring your PC to it's knees install Oncecare.
MSMPENG will utilize all your CPU time and your screen writes
(OLD MAINFRAME GUY,SORRY) take forever. Booting uo takes 20 minutes. Exploring your Pictures Directory is painfully slow.
This product also attempts to update the O/S and Office and doesn't bother to check if those updates are already installed.
Immediately after running uodates from the o/s and rebooting Onecare Tune up said the installed updates need to be installed.
Incredible Junk! at $59 is easily twice the price of other products. My disk access led was on the entire time I booted up, opened IE, searched this issue and wrote this note...it just wnet out,freakin lovely,just lovely
Left by Virgil on Oct 04, 2008 8:48 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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how do u delete windows defender?
Left by elaine on Oct 27, 2008 8:13 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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i have had the same problems in the past. rectify it by turning off Defender if you notice it running....or.delete it from ADD/Remove Programs. there are many choices of malware programs, my current favorite is a program called " Malwarebytes". it is fast, very efficient and FREE!!! it does what Defender should do.
Left by jim on Dec 27, 2008 3:55 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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One additional solution that helped me.

Windows defender/Onecare will scan files that are recently changing.

And

Windows Search is constantly updating files

So.

Add the following directory to the exclusion list:

C:\ProgramData\Microsoft\Search
Left by Tim Larson on Dec 28, 2008 12:49 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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Here is a solution for you all. Unistall one care. Run Malewarebytes, and remove the many problems that you will not see with any other of the free anti virus software (AVG, Antivir, etc.), and then install commodo firewall and antivirus scanner. It is free and does not slow down startups, and does not bother you with updating every time you start your computer. It is very good. Malewarebytes is used by every good computer tech, and it is free. And you can kill the msmpeng, just don't kill msfwsvc.exe and you will be able to keep the msmpeng.exe from coming back while you are scanning with the malewarebytes. Hope this helps you all.
Left by David Shade on Jan 24, 2009 9:52 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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Phil gave a pretty good solution, Now def. will stop scanning itself for viruses... a thing that most of anti viruses do. If an anti virus program wants to be infected that means there's a problem. And with huge lag spikes that the defender offers us, it leads to the thought that it agrees with the previous sentence. If you end up with an infected anti-virus, i wont envy you. So as said, ill wait for the new windows update to see if they get that fixed and meanwhile, why not trying some other software that you might enjoy more than windows defender? Jay gave a pretty good one, and malawarebytes is still there. Avira AntiVir Personal is also not a bad one, it helped me out in times. there are also tons of specific scanners (some of them are flukes) that can be very helpful. Look into that and show a finger to Win.Def. for now. Its a pretty shitty program anyway :)
Left by ChronicDreamz on Feb 01, 2009 8:14 PM

# re: MsMpEng.exe is the nugget draining my CPU...
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ignore the script kiddies who boast they are writing viruses and are telling you to uninstall this. they want you to uninstall it for one reason and one reason only, so they can spread their ill-informed opinion and gain access to your PC, the more they get to do this ,the more systems are vulnerable.

Stay safe, stay protected.
Left by aperson on Feb 03, 2009 10:58 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Not all MsMpEng.exe seem created equal. I have Forefront client security on a netbook and it is running like a dream. No appreciable performance drop and no reason to suspect its AV abilities. This is on XP Pro SP3, quite impressed really
Left by Michael Williams on Feb 18, 2009 11:20 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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Alright, the exclusion of WL1C folder is one option, but you COULD just exclude the actual file (msmpeng.exe). It works just the same, and leaves less room for error.

FOR THOSE OF YOU THINKING OF REMOVING WL1C:
That's fine and dandy, but you should keep some other sort of protection going.

FREE ANTI-VIRUS:
AVG = shit. PC Tools = junk. ClamWin = mediocre. Sure, if all you're doing is playing Solitaire and occasionally checking your email, AVG/ClamWin are probably good enough (unless you're the sort of moron that can't spot a bad email).
I prefer Avast.
Cyberhawk is neat, but there are a lot of false alarms because, instead of using a virus database, it flags viral program behavior. If you know how to pick out the legitimate programs, the false alarms shouldn't be a problem.
HandyBits is a program that uses all of your virus scanners at once to scan your computer.
RavAntivirus is a virus scanner that runs in your browser. The reason I mention it is because it will actually remove viruses that it finds, too.

NON-FREE ANTIVIRUS:
InVircible is like Cyberhawk.
McAfee makes me cringe.
Kapersky looks pretty good, but I've never tried it. I know for certain that it gets rid of backdoor trojans and logic bombs, though.
WL1C is alright. It doesn't seem to be catching any viruses, so it's either keeping them out, or missing them completely. I've yet to lob all manner of viruses at it from my desktop.


Left by Sasha on Mar 02, 2009 9:30 AM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
Due to my PC's poor performance several months ago I deleted Adaware and installed Windows Defender. I feel that move degraded the performance even further. Although I since have AVG update and scan everyday, I do want a second safeguard on duty. So, I have deleted Windows Defender and installed the recommended Malwarebytes. On the first scan it found 11 infections within the first 1000 files that the other two scanners missed !
Cheers jfg
Left by TR3A on Apr 01, 2009 4:13 PM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
Thanks people: i thought my old PC had caught a virus as it was going so slow but, yes, it was MsMpEng hogging resources. Have removed the (trial) OneCare - problem solved :) Now all i have to do is get a competent anti-virus package installed... ;)
Left by Richard on Apr 05, 2009 5:51 AM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
Go to Windows Task Manager on the Top Left Corner - Click into - File - for - New Task ( Run) - Then Types MsConfig on the Blink Space - then Click OK - when Folder is open Then Look for Startup on the Top Right - Click open Folder - then go Uncheck all these 4-Folders Mention :- McciTrayApp, btdna, ctfmon & MtdAcq then Click OK Button / then you could go Back & Browse at Windows Task Manager - Click on to Process & Look for MsMpeng.exe - You Will Find its Running very Low Used on CPU for your Computer - It Works Great, it Does the Wonder & BTW Jobs well Done, Enjoy the Day with your Computer! :-)
Left by friday on Apr 20, 2009 2:56 PM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
Same problem on older Dell laptop w/XP SP whatever, running Windows Live One Care (it'll be over soon..:)) and started having the issue discussed. Gotta be something with those auto updates?? Read the whole thing, did the solution proposed 4/20/09 by friday...seemed to work great..haven't restarted, but can always come back to it..may also look at old Sony desktop with running disk...thanks to everyone for their advice/solutions..will visit again!
Left by Dan on Apr 28, 2009 11:29 PM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
I know or at least suspect that it is all a conspiracy to force us to buy more powerful PCs. Trouble is, there is no one left that is believable. HP all-in-one was killing my PC with different processes (I wonder why?). Threw it out for Epson, and now MS Onecare is the remaining culprit. Maybe Linux is the only solution. Isn't it strange that we now have PCs that once supported thousands of users to now run just one? Not sure what the solution is, I don't see any lawsuit being fought by PC users. Honesty is an old and forgotten attribute. We are simply pawns used by multinationals to make more money by forcing us to buy more technology that although brilliant has built-in or introduced flaws to force us to buy something new. This may sound like a bit of a rant, but that is my conclusion. As for Security Software, I threw out the previous software that I was using, because it appeared to fail to start (the SysTray Icon was not appearing). I subsequently discovered that this was a Windows bug, because I had the same problem with OneCare. OneCare appears to be a reasonable product, however when it doubles the boot time, I cannot accept it. I will disable auto-updates and ignore the big warning and see if that helps. Five minutes to boot a 3ghz hyperthreading PC using XP is just not acceptable.
Left by brianoh on May 20, 2009 2:34 AM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
I disabled auto updates for Windows/Onecare, and boot time is still too slow. I do not want to restrict OneCare search criteria, because I think that could possibly defeat its purpose. The only answer appears to be a better Antivirus solution. I guess there is one, but the amount of cr*p one encounters searching makes the task impossible. Add to that the time to evaluate, and the risks posed, and there appears to be no easy solution. I read that M$ is proposing a free solution - Morro, and a beta is proposed within the next few months. I wonder what new problems that will introduce. It appears illogical that MsMpEng has to do so much work on booting. After all, when the machine was shut down, it was running. It is not as if something could have infected the PC when it was shut down. Possibly it automatically runs its Quick Scan option on reboot. If this is the case, it appears they don't trust their own software.
Left by Brianoh on May 20, 2009 4:02 AM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
I came here following the trail of unhappy breadcrumbs - after having disabled the Defender service first. I followed Phil (bless your little heart!)'s suggestion from two years ago - first had to restart the service, then go into the program as he suggested, etc.

I'll see if this works. If not, I'll cheerfully disable the service and put an end to it. Survived for YEARS without the silly thing and I see no need to have a resource hog bog down my pc, thank you very much! I have or can get other tools that will suffice. :-)
Left by Linda on May 22, 2009 2:51 AM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
Phils suggestion worked for me too. Been bugging me for months (actually over a year) and been rebooting the laptop to stop it.

Thanks!
Left by george on May 24, 2009 12:25 AM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
I would love to try Phil's suggestion - but my PC/ XP SP2/ LiveCare doesn't have Defender ANYWHERE!
Left by Amoebas on May 31, 2009 9:18 AM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
The similar or successor product is Microsoft's Forefront Client Security. If you can't find Defender, look for Microsoft Forefront under the Start menu.
Left by Brad on Jun 16, 2009 2:12 PM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
I have both Zone Alarm Pro and Windows Defender running. While I have noticed some of the problems mentioned here, my biggest issue was booting up in the morning. I did as was originally suggested here, but in Windows Defender itself. I do not run LiveCare. I noticed a significant reduction in boot time (>30 minutes vs ~10 minutes) which is from power on to fully logged in and able to use. Here are the step-by-Step instructions for doing this:
1) In XP click on Start then Run and enter "C:\Program Files\Windows Defender\MSASCui.exe" and press OK. In Vista enter "Windows Defender" in the search box then click on it in the list.
2) Click on "Tools" then "Options" and scroll down to the bottom and locate the "Advanced Options" area. Click on the "Add" button to the right of the "Do not scan these files or locations:" text box.
3) Locate the MsMpEng.exe file. This can normally be found at "C:\Program Files\Windows Defender\MsMpEng.exe".
4) Once selected, click on the "OK" button.
This will then allow Windows Defender to ignore its own engine program enabling your OS to perform with less CPU usage.
Hope this helps
-JDan
Left by JDan on Jul 08, 2009 9:11 AM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
JDan, your instructions for Windows Defender worked like a charm instantly!!!!
Left by mrsbuster on Jul 18, 2009 1:53 AM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
What is the newest best way to disable MsMpEng.exe??
Left by Richard Pond on Jul 31, 2009 3:01 PM

# How to stop defender
Requesting Gravatar...
I know how to fix it. Go to defender in the programs list in the start menu. Once you are in defender click tools up the top and then click options. Now un check the box that says Automatically Scan My Computer. Now scroll down. Un check the box that says Use Real Time Protection. Then click save and exit defender. Done!
Left by computer tech on Aug 31, 2009 6:53 PM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
it probably means it's scanning your computer.
open up defender and just cancel the scan.
Left by michael on Sep 27, 2009 3:38 AM

# re: MsMpEng.exe is the nugget draining my CPU...
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It seems that the "latest and greatest" new "free" release by Microsoft "MS Security Essentials" (virus checker) runs the same MsMpEng.exe and hogs the hard disk for 5 minutes or more at start-up. I had to delete both Defender AND Security Essentials before this CPU/Harddisk hog would disappear. Thanks to everybody that posted here; I have lived with this problem for months and finally seem to have it resolved.
Left by DavidL on Oct 05, 2009 9:46 PM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
By the way, with Microsoft Security Essentials and Windows Defender both installed, I had TWO copies of MsMpEng.exe running and fighting for CPU time. Although I tried most of the fixes in this thread (other than third-party items), nothing worked until I uninstalled both. The difference is astounding; I used to start my computer and then go have breakfast and a coffee while I waited for it to become usable; now I am ready to go as soon as the boot is comlplete.
Left by DavidL on Oct 06, 2009 6:09 AM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
Personally... phil has a great idea... and for those who say "it's probably just scanning... stop the scan"... that's just proving you didn't read the earlier posts explaining the KNOWN bug in the program.

And for those who give instructions on just simply disabling the software... I am not sure if you are AWARE that this is what you are doing, but you might as well just uninstall it if that is your solution.

Comments like "svchost.exe is your internet" is just hillarious to me. That is like saying "the door knob on your front door is the whole house". RESEARCH something before calling somebody else an idiot.
Left by Lokpique on Nov 10, 2009 4:42 AM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
Hey, good to know I'm not the only one with this problem. I've noticed something though, that I don't think anyone else has noticed yet. MSMPENG.EXE runs near 100% CPU usage when installing/using any known MS competitors' software, such as OpenOffice or Chrome. I thought I had done something wrong to slow down my machine, and had the TaskManager up and watching CPU/Mem usage while I was going about my day. Long story short, every time I used OpenOffice, Chrome, Firefox, iTunes (not all opensource, I guess), Audacity, RealPlayer, 7zip - the CPU spikes. This is just a short list, but you get the idea. I thought at first (like I am guessing you are) that it's doing it to everything. Not so. I then ran the Windows built in compatriots of the above mentioned programs - Office 07, IE8, Windows MediaPlayer, use the built-in unzip program...nada. Not a blip on the CPU usage meter. MSMPENG.exe wouldnt move from 0% while using these. So I closed them and fired up the other non-MS branded programs again and lo and behold, instant CPU spiking again that would last from the moment I clicked to open until 3-5 minutes after they closed. Maybe I am reading into this too much. Maybe I am seeing something there that isn't...but it seems awfully coincidental to me. Anyone else notice this or have anything to add, or want to tell me I am crazy?

Using an Everex SA2053T (1.7GHz Pentium dual core, 2GB ram, Win7 HomePremium), and an Acer Aspire One ZG5 (1.6GHz Intel Atom, 1.5GB ram, Win7 HomePremium).
Left by Saint on Nov 16, 2009 12:21 PM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
I had the same issue because I had running Windows Defender and Microsoft Security Essentials. Below is what I found about this issue. Just use MSE or any other antivirus software, but disable Windows Defender. At least on Windows 7 it can be done via Control Panel.

Q: How is this different from Windows Defender?

A: Windows Defender detects and removes known spyware only. It is not designed to protect against the full breadth of malicious software, and specifically does not prevent viruses, worms, Trojans, and other malicious software from infecting your machine. The new no-cost solution will be a comprehensive anti-malware solution.


Q: Is Microsoft Security Essentials designed to replace Windows Defender?

A: No but if you are running Microsoft Security Essentials, you do not need to run Windows Defender. Microsoft Security Essentials is designed to disable Windows Defender in order to manage the PC’s real-time protection, including anti-virus, rootkits, Trojans and spyware.


Q: Does installing Microsoft Security Essentials disable Windows Defender

A: Microsoft Security Essentials should disable Windows Defender on Vista and Windows 7 and uninstall it from XP. In some cases, this does not happen automatically.


Q: Do I need to manually disable or uninstall Windows Defender if I am using Microsoft Security Essentials?

A: If Microsoft Security Essentials did not automatically disable Windows Defender on Vista or Windows 7, you should disable it to prevent conflicts. Windows Defender cannot be uninstalled from Vista or Windows 7.
If Microsoft Security Essentials did not automatically uninstall Windows Defender on XP, you should manually uninstall Windows Defender via Control Panel/Add or Remove Programs.


Q: What happens if I do not disable or uninstall Windows Defender if I am using Microsoft Security Essentials?

A: If Microsoft Security Essentials and Windows Defender are both running, your system may experience performance degradation and other problems caused by the conflict of two services providing real time protection simultaneously.

THis info was found on site:
http://social.answers.microsoft.com/Forums/en-US/msestart/thread/5309cb8d-02e1-40e8-974f-0dcedb9ab9fd
Left by Rubidze on Nov 20, 2009 9:06 AM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
Hey ... I really LIKE that UNinstall feature. Solved the problem.
Windows OFFENDER, eh -defender - POOF!
Here's what's up. There IS an agreement between MS & Hardware manufactures that the DOJ missed. Here's how the scam works: MS says "Install our operating systems on your PC's; --And we'll gradually make the code less efficient & hog like -requiring the customer to upgrade their computers -driving your hardware sales up.". This is soooo obvious -as every release of a MS OS has soon been followed by "SP-X" "upgrades" that always clunk the machines back to the stone age. Remember the impact SP2 had on XP? The "cure" was worse than the "disease"! No accident. And now MS has "security software" that makes machines crawl & they can't seem to "fix" the problem? It's because they don't want to fix the problem! They want you to buy a new PC (with a new OS)!
Left by Curt Esident on Nov 27, 2009 1:22 AM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
Can't uninstall as the network admins are forcing this on us. Going into Microsoft Forefront Client Security and choosing Tools/Options and going to advanced options and adding C:\Program Files\Microsoft Forefront to the "do not scan these files or locations" DID NOT FIX my problem.
Going to Control Panel/administrative tools/services and disabling Microsoft Forefront Client Security Antimalware Service (or even setting to manual vs. automatic) WORKED for me. Thanks!
Left by vgp on Jan 04, 2010 3:35 PM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
I don't have Windows Defender OR Live Care installed. Never have; never will.

I found MsMpEng.exe was taking up a lot of usage.

I followed this advice from Mike (2 years ago) and it works!

"I found that if I uncheck the; allow third party extensions in the advance tab in the Internet options. It is located in browsing, cure the MsMpEng.exe. Reduced it to 0%."

MsMpEng.exe is now gone. Thanks, Mike.
Left by Julie on Jan 08, 2010 3:15 AM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
Thanks for the "exclude file" advice. I have an EPSON all-in-one, and the msmpeng.exe was pegging when the escndv.exe epson scanner driver was running.

Excluded the file, and scanning is now bearable.
Left by solikedude on Jan 27, 2010 9:53 PM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
You can also exclude graphic files. I excluded jpg and gif so the machine doesn't die when I go to My Pictures. So far as I know those two can't carry a virus - Yet!
Left by Jim Mooney on Feb 22, 2010 10:38 AM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
try Microsoft Security Essentials, Settings tab, Real-time protection link (on the left) and turn off "Monitor file and program activity" (but keep Download monitoring). This seemed to help me.
Left by JohnJay60 on Mar 27, 2010 8:10 PM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
@Jim Mooney: There are viruses that use images as an attack vector. I'm not saying it's likely that your pictures will be infected (and keeping windows and your applications patched and up to date should be enough for these viruses since they tend to rely on security flaws in the applications that read the images) but you should bear this mind when making the decision to exclude them.

I've got the same msmpeng.exe problem but as a programmer I'm looking at it from a slightly different angle - i.e. Is there actually any way that non-Microsoft applications can perform certain functions without msmpeng.exe crippling their performance? My quest continues...
Left by Luckyrat on Apr 08, 2010 2:50 PM

# re: MsMpEng.exe is the nugget draining my Virtual Memory...
Requesting Gravatar...
Hi all -- I too am having a drainage problem with MsMpEng.exe but its not with my CPU its with my VM(virtual memory)
Also, I DO NOT have either Windows Live Care or Windows Defender...not anymore anyways..I removed from Add/Remove and MsMpEng.exe is still there.
However, I do have Microsoft Security Essentials..and this is the only one I am running. I no long have NAV 2009 due to not having the money to subscribe this time. So I went with micorsoft because I trust them. (maybe I shouldn't lol i dont know)Anyways--
In the Windows Task Manager and under processes tab and VM size it says: 133,760. Isnt that alot of virtual memory thats being used? All others say 1000-20,000 VM.
Its just annoying me because I have done everything from go to Internet Opts--services.msconfig--removed windows defender--and I dont know how many forums I have google. and binged..lol..Im about tired of this Cr@p..lol
So any (MORE) suggestions or help would be so much appreciated...thanks in advance..Denise :)
PS -- Am I just maybe worrying over something thats really not that tragic or important to try and fix?? Should I just like don't worry about it and get on with my life?..lol...
Left by Denise on Apr 09, 2010 6:54 PM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
@Denise: MsMpEng.exe is part of Microsoft Security Essentials too. 133,760 K isn't anything to worry about (it's a bit lower than mine). If your machine shows no other symptoms then just get on with your life. If your computer gets very slow when you run multiple programs at the same time then it may be worth looking for some more memory (RAM / VM) efficient security software but you'll be lucky to find an alternative that does a good job while using much less memory so if you are in that situation, a memory upgrade would be best.
Left by Luckyrat on Apr 22, 2010 6:13 PM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
I too have Microsoft Security Essentials, on xp, and whenever i enter my documents or someting similar it will freeze the window. Ending the progam just crashes my computer, but as soon as i end msmpeng, ehat do you know, it works again! My computer should be able to handle such a task as i've got 4gbs of ram.

Disabling the "monitor file and program activity on your computer" stops the freeze from happening. But you also then get the annoying complain bubbles telling you that you're antivirus is turned off.
Left by Bob on Apr 26, 2010 1:57 PM

# re: MsMpEng.exe is the nugget draining my CPU...
Requesting Gravatar...
I have read all the forums and at the end would like to say you all guys why to go for longs hours in troubleshooting your pc just go ahead and buy iyogi annual unlimited subscription plan for just $139.99 . Call them for any technical troubleshooting number of times in a year and they will help you out .
Left by Anupama Bhatnagar on May 26, 2010 8:37 PM

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