My problem started with my old GFX card (6800), where whenever I played CSS I would get the odd flicker on screen every now and then. I thought perhaps the card was overheating, so I tried a different card (6800GT),and the problem seems worse now CSS would flicker until after 30mins or so the game would freeze and I'd have to reboot. This would also happen in HL2:EP1 but that wouldn't flicker just freeze 
Now playing COH my pc would reboot after approximately 20mins or so but again no flickering. Upon reboot windows would say that it's a unkown driver is causing the problem. I have tried a couple of GFX card drivers, checked my temp which under load was 70o (dunno if that's OK?)
Also I'm running X64 so drivers especially for my motherboard they are limited. I really don't know where my problem lies but if anyone can suggest some drivers to try that would be a start..
Any help/suggestions would be great..
Cheers
Edz

Now playing COH my pc would reboot after approximately 20mins or so but again no flickering. Upon reboot windows would say that it's a unkown driver is causing the problem. I have tried a couple of GFX card drivers, checked my temp which under load was 70o (dunno if that's OK?)
Also I'm running X64 so drivers especially for my motherboard they are limited. I really don't know where my problem lies but if anyone can suggest some drivers to try that would be a start..
Any help/suggestions would be great..
Cheers
Edz