My PC, an Athlon 2400 xp on a PCChips m811 mobo, geforce5700le, 768 MB RAM, KT266/333 chipset, all drivers upgraded (I think) has been restarting when I run Spybot S&D or wizardry 8, or even the old Magic The Gathering game from '96. I have tested the ram repeatedly, run multiple different spyware/AV scans, even reinstalled Winxp and updated to SP2 and blanked all the HD's and the problem still persists. I am thinking it could be the mobo, ram, PSU, or Video Card, but I am not sure where to go from here, being relatively noobish. Any help would be appreciated!

I also recieved several BSoD messages after unchecking restart on error. Here's one

0x00000050 (0x884501f0, 0x00000001, 0x8056765B, 0x00000000)

Greek to me...

Hi welcome to the forum if the PC has problems with the clock it most likely need a new bios battery and possibly the bios reset. This is very easy to do instructions below

How to replace the CMOS battery.

I am really beginning to think it is the PSU...I wonder if the fact that I have 3 HD's internal is a big draw on the power supply? I will replace the battery later, I want to find out if the mobo is bad first.

Well did you know that the times power is supplied by the bios battery and not the power supply so changing the power supply will not fix the time problem trust me I've been doing this for many many years. The BSOD could be power related. This will tell you if it is good enough PSU Calculator

yeah. i have to agree with madmatt. it definetly sounds like the CMOS battery is low. all settings are kept, and the system clock is maintained by that little battery. that is wy when you unplug your computer, your clock doesnt stop or reset. just go to the local drugstore, and pick up a 3.3v Silver Oxide, Lithium ion, or other. the type of battery, i find, doesnt make any differeance usually

I actually replaced the battery and discovered this page:
The computer may automatically restart, or you may receive a "serious error" message or a Stop error message in Windows Server 2003, in Windows XP, or in Windows 2000

The problem is apparently a rootkit of some sort even though I zeroed all the HD's it was left over from unprotected surfing, apparently. I tried following the directions, but I can't seem to find any files with an HA and all the .sys files look random to me. I am convinced of this, as ZoneAlarm would detect a rootkit, but was never able to delete it upon restart. I guess this would now be a software problem, but I think I'd like to leave this post here if no one objects, since it looks so much like a HW prob. Just tried windows Defender (yes, I'm that desperate) and it showed nothing (quick scan). Going to try the full scan overnight.

I found the above link through a BSoD code I got the last time it shut down. Enough tearing my hair out for tonight.