I am playing more with the Windows Developer Preview and simply love the backward compatibility it has for applications that used to work in Windows 7. And one of the applications critical to my day-to-day life is Visual Studio. Visual Studio 2010 with SP1 and ASP.NET MVC 3 Tools is my everyday requirement.
Windows Developer Preview when installed from the MSDN Center has two flavors. One with the Developer Tools which I would assume, most of us developers would want and the other one, which is simply the Windows Developer Preview (without the Tools).
And the Tools that it ships with has a version of VS11 Developer Preview which is just for building Metro Style applications. If you plan to use the same for web development (using MVC or Web Forms) you need to install a separate version of VS11. I had blogged about this earlier
I was setting up Windows Developer Preview as my primary development machine so in addition to VS11, I also required VS 2010 to be installed. So, I installed VS 2010 and the SP1. Post that I was trying to install MVC 3 for VS 2010. It simply took a long time and then rolled back the installation 
I tried couple of times just to repro and found the same results.
The interesting thing is, MVC3 for VS11 installed happily on the machine. (MVC 4 was already installed)
When I checked with Phil Haack and Jacques Eloff they neatly helped me with this. Essentially MVC 4 has a newer version of NuGet installed and that was preventing MVC 3 for VS 2010 to be installed. The steps to resolve are quite simple.
Uninstall NuGet from Add/Remove Programs.
Install MVC 3 for VS 2010 from here
That’s it. It would automatically reinstall the NuGet.
If this post was confusing like my earlier post read it again 
Cheers !!!