Try to go into the nvidia driver archive and get a slightly older driver. See if that works. if it does. Contact Nvidia to let them know and it should be fixed in the next release.
I remember many issues from Nvidia drivers in the early vista days(even after SP1 was out). Going back a driver revision or 2 always got me going again.http://www.nvidia.com/Download/Find.aspx?lang=en-us
There is also a beta you may try.
EDIT....wiinippongamer so beat me to it