Ok, so something in your system is not stable then?
What I do in thoce cases is this:
remove all peripheral cards. Rub off the connections with a pencil eraser. This removes the oxide or whatever deposits, which can sometimes cause intermittnet connections. Make sure that you don't put your fingers on those connectors.
Do the same with the ram. Make sure that it is seated firmly.
That alone usually fixes most of my problems. The next step is cleaning the mobo. That dust everywhere can cause random currents to flow everywhere, especially with static buildup. Clean with a soft brush.
After that, if there's still a problem, then I start suspecting a faulty component, typically a VC or HD. I'll swap the VC for an old one and check it out. I've used mostly ATI cards in my systems, and for some reason, they all seem to start crapping out on me, over time. I should probably try reloading the drivers, and updating them, but most of the time, I'm in a rush, so I just step back the GPU to minimal acceleration, and everything is kosher again.
HDs are harder to deal with. Either they work, or they don't, and it can't really be swapped without a full re-install of the OS. I typically try leaving it alone in the system, by disconnecting the CD-rom completely.
Given more time, I'd use some benchmarks, but I don't, so I don't.
Let us know.
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