“Unspecified error” in Visual Studio 2008 when trying to view project properties

Question

When I set my active solution from Win32 to x64, I cannot build the project or view the properties.

When I try to build my project, it is skipped.

When I try

Answer 1

I had the same issue with Visual Studio 2005. I fixed it by running Visual Studio install/repair and selecting the 64 bit components under the C++ install options.