Installation trouble win7 x64 Can't install CUDA

I installed Visual Studio 2008, I also installed my Intel fortran compiler which uses VS as a shell. Finally, I installed the latest (257.21) drivers and the CUDA SDK. However, I can not get CUDA itself to install. For some reason, I run it, and it asks for my permission to modify, and then it seems to go off into oblivion. I’ve also tried right-clicking and running as administrator and it still just sits there. Any ideas? This is my machine with the GTX 480, so I really need to get it running on this computer.

Thanks for any tips!