The problem was that the remainder of MVC2 remained on my computer. Removing it did not completely delete it, and a couple of the remaining files stopped the new MVC 3 installation. I apologize for not having the right URL, but someone wrote a blog on this subject and gives you a step-by-step guide. I should have done even more than he suggested, but that was the solution ... to clear every last remaining MVC 2 or MVC 3 CTP from your computer.
source
share