Yah im not sure dude. Your cooling is fine 45c for a amd is good. Umm hmmm, try a differrent powersupply maybe. Someone might know a way to test them. Your xp install seems good because you had no install errors when loading it. Its only happening when putting a large load oon our cpu. I wish i could help you, i actually think ur psu is fine too. All i can say is if you have extra parts lieing around...then change them in and out. If not...well listen for someone that might have the same problem. If you get an error message of any kind you can search it on the internet.
P4 2.26 ghz, Intel d850emv2 mobo, 768mb of pc800, sony 4x dvd-rw, teac burner, nvidia ti4600 graphics, enermax 330watt ps
4 silent uv fans, cold cathodes in full tower antec case, round ide cables
SOny vaio 2.66 ht ghz modded into raidmax case with green cold cathodes.
P4 2.8ghz HT, 512mb ddr, Intel KD865gbfl, onboard video, raidmax case, blue cathodes, round ide, loomed wires, 4x dvd burner, wd sata 80gb hard drive
Intel d865perl, 2.8ghz northwood, antec sonata, wd caviar 20gb, Corsair 512mbx1 for now. 380watt psu, ati 9600, dvdrom cdrw floppy in black too match case