You could also check on the OMEGA drivers page. They supply specially modded drivers for several makers and cards. I had loads of problems with my ATI card until I went with OMEGA. However, I havn't been to the site in a while (my drivers work... if it ain't broke don't fix
so I'm not sure whether they do nVidea, although I think they do.
OmegaDrivers.net - Home of the Omega Drivers for ATI & NVIDIA desktop/laptop cards. By: Omegadrive