Nvidia Geforce 6800 Displays Green Screen On All Videos

It has worked fine for me since i bought it approximately 8 months ago. But as one of the games i play updates i'm starting to get color flickering issues. So i updated my graphics card driver, which fixes the game, but causes a worse problem. Now every single video player i use, or have tried using(with exception of quicktime), displays a green screen for the entire duration of the video. I've tried changing to old graphics card version, and it fixes the videos, but then my game is messed up.

Any advice? I'm not very computer savy, and this is a real annoyance.

Just to add its an agp card. Not sure if that matters