I just recently changed my XFX 6850 to a Twin Frozr II 560 GTX TI Factory Overclocked. When I'm playing games, my screen will freeze for a few seconds and green, purple, blue fuzz will appear on my screen. When I alt-tab it says that the Nvidia Windows Kernel Mode Drivers have crashed. I've tried reinstalling the drivers several times, updating them, and reseating my card. Not sure what to do, any help?