eVGA 6600GT pixalation problems

[hawk16]

I have recently just started to get these problems, ever since like october when I updated my drivers from nvidia.com. Everytime I go into a game, after a while or a map change everything gets all pixelated and everything is just wierd. I see images stretched out all over the place and giant spikes of color running all over the place etc... It is really annoying because the only way to fix it is to restart my computer but restarting my computer every 30 minutes is very annoying. Anyone know of a way to fix this?