Craig Nicholson : Visual Studio 2005 Beta 2 won't start workaround.
I recently ran into a problem where Visual Studio 2005 would launch, splash screen would show, then the CPU would peg at 100% and that was that. No IDE, nothing.
After messing around and not getting anywhere I ran into the blog entry above. In short you run the devenv.exe with the parameter /resetuserdata and wait for the devenv process to disappear from the task list.
Voila! Worked! I have my environment back.
Cheers,
Robert Porter