I'd like to add that my problem occurs more frequently and severely when I play ArmA 2. For instance as soon as I start the campaign, the crash problem will happen within minutes. Usually with OA it'll happen after 30-40 minutes. Which makes me think it has to be a driver issue. The strange thing is I played ArmA 2 on my previous system with the same 295 GTX card without this issue? I should try re-seating the card in a different slot and see if anything changes.