Looks like MSVS 11.0 Beta spoiled a MSVS 10.0 installation

Question

I ran into compilation problems with my MSVS 10 after installing MSVS 11Beta. Now, when I compile my C# Projects in MSVS 10 (Projects created in MSVS 10; Target framework: 3.5),

Answer 1

How long is your username?

It seems that there is a bug when the username is 20 characters long. If your username is 19 characters or less it works fine.

I have opened an issue on connect.

Edit: Have you tried setting the environment variable DisableOutOfProcTaskHost to true as suggested in the connect issue, that worked for me.