Windows XP randomly rebooting and/or bsoding

[TyKoN]

After spending a few days messing around to get my vista stable, I decided to give up and go back to xp, which I thought would be much easier to install. No luck, now my computer is randomly restarting without a bsod, or crashing with a STOP: 0x0000000A error. My ram went overnight on memtest without erroring, my harddrive was deemed fine by seagates hard drive diagnostic test thing, and I'm pretty sure my cpu and my graphics card are fine. My systems specs are:
Q6600 g0 stepping @ stock
Thermalright Ultra 120 heatsink
seagate 320gb 7200.10 sata drive
2x1 gig mushkin 5-5-5-12 DDR2 800 ram
x1900xtx 512mb @ stock
550w antec NeoHE power supply
Windows XP pro SP2

can anyone offer any advice? google search doesnt help much, 0x0000000A is an extremely common error.

 

[AnonymouseUser]

You definitely have a hardware issue, most likely PSU or CPU related.

There are three +12v (@18A each) lines on that PSU, so maybe switching between those on your mobo will give better results? Also, is 18A enough for the Q6600?