i installed the 320.49 beta drivers for my gtx 660 earlier today and the pc black screened and would only boot at very low res and there was random blue pixels over the screen. i have rolled back the drivers and tried booting again and it is still not working. It has been working faultlessly for the other 20 odd hours that it has been in my system and was not overheating. I have put my gt610 back in the system and it is working fine again, but every time i try the 660 it doesn't work. HELP!