Reinstall your graphics drivers and see if that fixed it, if not open your computer and check for dust clogging air ports and fans, blow all the dust you see out. You'd be surprised how much dust can overheat or affect a system, I had a similar problem, when the dust was all gone it was back to normal. The part where you said "This doesn't happen instantly." makes me most suspicious of the card overheating quickly after working to produce GW's graphics.
Last edited by Bob Slydell; Aug 20, 2009 at 05:34 PM // 17:34..
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