Check the cooling on the pc aswell. I went trawling for similar problems and got a very close hit to do with P4's overheating and overtaxing the CPU causing stutters, freezes and instability. Another mention was whether the BIOS CPU idle temperature (if you can access that, depending on BIOS) could be too high meaning its working it for no reason.
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Back into the hunt after far too long,
GWX 3 Gold, SH3 Commander, DiD Rules, 27% realism and rising
Intel Core2Duo 6400
GeForce 8800GTS
4 Gig DDr2
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