Display Driver Issues

I hope someone can help with this.

In the past week, my display driver has taken to crashing. Vista pops up the little message "the display driver quit and has recovered". But this thing does not recover. My screen is covered with hundreds of little black and white horizontal lines about half a centimeter across and one pixel tall, that flicker all over my screen. And occasionally a huge black or white zigzag will tear across my screen for a second or two.

The problem seems to be connected to the driver, and I can't screenshot it. Monitor works fine, switches inputs ok and everything. Only way I can solve the problem right now is to reboot, which is getting really old.

The problem occurs most frequently while I'm running World of Warcraft and Internet Explorer, but I do that a lot and don't want to have to quit.

Does anyone know anything about this problem, or how to solve it?

I think your video card is overheating, which would mean a new video card unfortunately.