It's definitly the hardware watchdog bsod's i get when my oc are not stable maybe its ram maybe the CPU. I think the games will not run great on a 8800gt though.
Consider to save up for a new system
i use a 25 inch lg 21:9 screen with 2560x1080 i really love the extra room left and right. every 16:10 or 16:9 is to small now. Once you go UW you never go back