If you have blue screen notification off in Windows XP, it initiates a restart not a shut down. Could still be a driver issue but I am going to go with overheating. 10-15 minutes is more than sufficient for the processor to overheat and trigger a shutdown if you have a bad or dust clogged cooling fan on it. Adding a fan blowing on the outside of the machine will have very little if any affect on cooling the interior and no affect on cooling the processor sitting under 3 inches of heat sink.
Couple the time and the fact that restarting the computer initiates a shut down, then it really does point to overheating. You need to pop the cover and inspect the fans. Your CPU heatsink it probably clogged with dust which prevents any air flow from moving through it.
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