I\'m running Windows 7 Ultimate (64 bit) using Visual Studio 2010 RC. I recently decided to have VS run/debug my apps on IIS rather than the dev server that comes with it. <
For me, the solution was to add the NuGet package Microsoft.AspNet.WebPages (plus it's Razor and Infrastructure dependencies) to my web project.
Infrastructure had to be forcefully reinstalled as it was not added as a reference at first.