VS SP1 messes up MVC 3?

I installed VS SP1 an开发者_StackOverflow中文版d intellisense for Razor (MVC3) stopped working. Did numerous searches for a solution and found lots of references to Resharper which I don't use. So I reinstalled MVC3 which didn't fix the problem. I uninstalled MVC 3 then reinstalled and now my project won't load! So I reinstalled MVC twice and still it won't load!

Now all I get is "The project type is not supported by this installation."

Even though I keep successfully installing MVC3, it no longer appears in Add/Remove programs.

If anyone could give me some tips as to what I do next they would be greatly appreciated.

Strange, is a complete reinstall of Visual Studio out of the question? Annoying bugs like this can often be solved a lot quicker by simply reinstalling the software.

I use 2010 and have encountered no problems with Razor or intellisense.