neverteaseit
This is a real stumper. If I was trying to fix this one I would do the following:
fdisk, format, load Win98 SE from CD.
Then, I would just let the system run for a day, full 24 hours to see if any errors occur. If so, then you have hardware problems, motherboard, processor, RAM, bad video card, something in that order, but the only way to tell at that point is to begin switching things out unless you've got a $1000 system tester that plugs into a slot and runs it's own operating system.
If you pass the first test, crank up Explorer without any plugins. See what happens.
The only way you'll find the problem is to test one thing at a time. Build slowly and test thoroughly through each step.
... or build another one.
Skinar