When trying to install the Release Candidate of Visual Studio (build 50727.26) on Windows Vista Beta 1, the installation will fail.
The .NET Framework on Windows Vista Beta 1 does not match the .NET Framework packaged with The Visual Studio Release Candidate which causes the failure.
The failure looks something like:
Error 25007.Error occurred while initializing fusion. Setup could not load fusion with LoadLibraryShim(). Error: The handle is invalid.
The workaround is to install Visual Studio on a newer version of Windows Vista.