If your system freezes then it is most likely a hardware issue. Software simply doesn't have the capability to lock up a system in user mode if it is functioning within normal parameters.
It might be a problem with your graphics card or memory. For example, I know that my 9800 GT overheats when I play Black Ops and will cause my computer to blue screen or shut itself off to protect itself.
Your best bet is to start replacing parts with spares and perform a process of elimination.
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