Okay, I'm running on an Athalon 1.33 GHz with 256K RAM and a 64K Radeon card: no problems. It's possibly GeForce-related, but you should also consider whether you've got any programs running in the background that "time in" every few minutes. These might include a memory manager, screensaver, atomic clock adjuster, etc. Any of these might conflict when they activate, and boom--instant reboot.
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