Id be checking out ur heat sinks first on both ur cpu and vga card (atm, to me it sounds like it could be cpu overheating). As mazex said, they could be filled with dust.
Do you ever get the old "ATI/ NVIDIA driver kernel has recovered from an error" during any sort of play? This problem sometimes rocks up and is a good indication that its ur graphics card either not getting enough power, or overheating due to dust.
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