Graphic problem after some time

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Hello
I am experiencing very strange problem. This problem is occuring in only two games NFS carbon and Perfect World. When I play one of the games, after some time the graphic start to drop fps very slowly until after like two hours the game is no longer playable. It looks very strange as very accelerated low fps.
The very strange thing is that I dont have to play the game. I just let the PC run for like two hours (doing nothing) and immediately when I start to play one of the games I got the same problem.
But after restarting the PC I can play again those games for like two hours and then again I have to restart...
Any ideas what can cause this ? And why it affects only those games ?
I dont have any problems with WOW, Oblivion...

My PC:
Athlon X2 3800+
2GB RAM
Gainward Geforce 7600GS (overclocked like GT)
The card is overclocked but with new cooler its not overheating beyond 50 celsius degrees
 
first of all are you using the most recent drivers and not the ones from the cd?

What is your PSU?
 
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