If it's hardware, just look for the buggy hardware. It's probably just a driver if it's a .vxd, but it might be windows. If all else fails, remove sound card and unnecessary stuff like ethernet and try to get it to crash again. If it refuses to crash, keep searching for defunct hardware.
Most of my bad hardware just refuses to work.
It sounds like video or memory or something vital to operation is failing. Do you have any junk stuff around to swap with? That's how I figure out what's failing me. Also check your temperature and fans in your system.
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