I have win vista 64 bit, nvidia 260 with 64 bit drivers downloaded today from nvidia.com.
Also, where is config file? There's a bunch of nonsense related to the build in the root directory but none of it seems to be the right thing. That stuff should really be put into some subdirectory and have things a user might want to access be in an obvious place.
Even more, it is pretty annoying it doesn't start in full screen mode by default, and that if you change the setings none of it gets saved.