This blog entry is dedicated to people who are frustrated from MSN Messenger. Time to time friends and other people ask me frustratingly that they want to disable or remove Windows Messenger from their system and I used to recommend them few steps but now they can be found on Microsoft website, the other obvious method is to rename Messenger executable, but I don't see that an efficient way, some other solutions that I found on Techrepublic are as follows:-
Click Start | Run and enter the following command:
RunDll32 advpack.dll,LaunchINFSection %windir%\INF\msmsgs.inf,BLC.Remove
Click OK.
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http://www.druid628.com/techtips/windows/msmsgs/killmsn.htm
Tejas Patel