I know you've put the problem aside but here's another thought;
With some Mobile GFX systems, the hardware/software/midware interface can cause the same issue and also cause BSOD (you look at the dump or the BSOD screen might tell you what module(s) are at fault).
Is it a laptop? Sounds like it.
Many laptops (and some PC's) shipped with on-board GFX Chips have proprietary drivers.
Try different drivers - (if they will be accepted) but a lot of the time they wont be upgradeable.
Good Luck
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