Ok. Here some possible problems. And a possible course of action. Some have been listed already. But I relisted in the name of creating an order of operation.
Edit: I listed this later on. But decided That he should check this first. vid cards have cheap fans no matter what brand you buy. If its not spinning that prolly your problem.
Always start with all the latest drivers and DX9.1a or what ever its up to now.
If ya got and extra hard drive around stick it inplace of your main drive and install windows and all + games that lockup. If it still locks then its the hardware and not the OS. This will save you from data loss.
IRQs might be the issue. But its prolly not. IRQs generaly cause slow downs and pauses, but most of the time it wont lockups.
Heat is a possibibity. That CPU is a very hot running processor. Dust is a demon. Its summer time and heat is up... You might have a cpu fan thats running slow. Other system fans failing can cuase the same. I.E. vid card fan, chipset fan, PS fans.
A bad PS can cause the same things, but usually causes reboots. But not always.
RAM can cause exactly these sort of problems.
Failed or abused vid card can cuase these things. Or bad fan.
These issues are pretty simple ones. Their may only be one way to solve the issue, and that is swapping suspect parts until you find the culpret. I.E. ram, ps, vid card. You may want to contact a local technician and pay to have it fixed properly. Its generally cheaper then buying parts on a hit and miss basis.
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If its not broke I'm prolly not done yet.
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