Graphics card could be the problem. Do you have the latest drivers installed or those that came with XP? The best drivers would be those from around 2001 2002, the latest drivers would be unsuitable in many respects.
The TNT2 is a dinosaur and M64 was also the budget version of the TNT2. All in all though I'd advise you to update that card to at least something from the 21st century. If you're unsure which card to go for, post a thread detaling your full systems specs and requirments in the hardware and software forum.
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