This use to happen to me, before I got my 8800GT. My northbirdge was overheating. I'm not sure if this will apply to you, because you have a card, but sometimes the northbridge has to work hard with the card.
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AMD Athlon 64 X2 4600+ 2.4ghz
2gb ram 800mhz
ECS C51GM-M
Rosewill RP500-2
PNY 8800GT 512MB
320gb WD
Windows Vista Home Premium
Rosewill R6252-BK
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