I have Visual Studio 2010 /SP1 / MVC 3 (With April Tools Update) installed on a machine with a fresh install of Windows 7 64-bit Professional.
I do not have resharp
I had this problem with one of my projects and the problem was the project somehow got converted to a Class Library project when I converted it from a standalone MVC app into an Orchard module.
Fixed by opening the .csproj file in a text editor and replacing this line:
{fae04ec0-301f-11d3-bf4b-00c04f79efbc}
with this:
{349c5851-65df-11da-9384-00065b846f21};{fae04ec0-301f-11d3-bf4b-00c04f79efbc}