I have Windows 7. I originally had Visual Studio 2010 Express, and installed ASP.NET MVC 4 RC. Because I have a student account and required the needs for some Pro features, I i
Under Control Panel, choose Programs/Uninstall a program
.
Find Microsoft ASP.NET MVC 4
and double-click it.
The Microsoft ASP.NET MVC 4 Setup prompt will appear. Choose Repair
.
Voilà! Open up VS 2010 Pro, and the MVC 4 template should be listed. On my machine, the repair took about 25 minutes.