Hi everyone, I’ve just finished half a day of getting CUDA up and running on Win7 64 bit, lots of useful info out there but my problem (and I suspect many others) was simple and nobody mentions it in any of the guides: The default installation of VS 2008 excludes the x64 dev tools needed to get 64 bit cuda working.
Make sure you have them installed!
If you need to just run the installer again and choose add/remove components (or some such).
I hope this helps someone.