I had a blue-screen the other day whilst playing SH4. Having not seen a BSOD for years, I got very anxious. Some troubleshooting later, it turned out one of my disks was failing, thus promting windows to stop all activity without any special warning.
Your problem though sounds more like some kind of memory fault. You've pretty much ruled out PSU, CPU or GPU fault by stress testing them with another application (umm, game). That leaves RAM. The kernel resides in the first 640kb of physical memory, so if you got more than one stick of RAM, try changing them around a bit, then do a thourough RAM test (google is your friend).
Also, the first stick of RAM is often neatly placed right beside the CPU fan/heatsink exhaust, thus ensuring it will get at least hot, if not exceedingly so. It might have reached a certain tolerance level, and sparked some freak error. By changing around the sticks, you'll put a less historically stressed stick in this voulnerable position, and thus gain some more stability. If failing RAM was the problem in the first place that is.
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