Anyone got a solution for this PC crap?

Ok, heres my situation.


My old 800Mhz PC I used for over a yr went through a rebuild about 2 months ago. It has Run Win2K and XP at one time or another.

Well someone finally wanted to buy it from me one day so I said sure Ill sell it to ya. At the time it had XP mind ya a Haxored copy but very stable just not used for any gameing mainly Quicken and some of my daughters games. So I take the PC and del all the 4yr old kiddy games off it and defrag it ect... The person comes along and picks it up. About a week goes by and I get this call from her sayin that this PC I sold her has just crashed and says some crap about an un-moutable boot volume, go figure it never freeking fails.

Anyways, It get the PC back about 2 weeks later and start digging into it wondering wtf happend to this perfect PC to which I capped somany flags and got schooled on somany times.

Attempt after attempt it gives me the same error, Unmountable Boot crap, sayign Turn off Caching in Bios, I do this no change. Finally I take the harddrive out of the PC and hook it up as a Slave to my good working machine and even it has trouble reformating it but a little twaeking here and there and walaaaaaaa it formats it.

I take the freshly formatted Drive back to my other maching and run the the XP install, it installs fine, even runs and install other software fine too so I reboot, not a total shutdown just a quick reboot and it comes backup *np* at all.

A few days goes by and the wife gets rdy to use it for quicken and theres the BSOD again. WTF pulling hair out of my bald head I loom in frustration I dont get it. SO I say to myself must be the Haxored XP, I then grab my Win2k non haxored CD official stuff and have to go thru the whole reformat crap etc.. all over again.

Machine once again works fine, this time I run scandisk and see if there are any bad sectors nothing disk is perfectly fine. So I say hmm guess this will work so I reboot once again cold not hard and boots up just fine. I leave the machine running all night wake up the next morining and its still working. So I then shut it down for about 30 mins and come back. Low and behold BSOD!!!!!!!

Grrrrrrrrrrrrrrrrrrrr, I am at my last solution for this one but have been too lazy to pick one up but I am thinking its the Cache battery going bad. I have heard it will loose like Harddrive settings and shit but this dont happen. It seems to keep time settings etc.... and the CPU settings.

Dunno, XP and Win2k are weird I have also heard that you cannot have like a P800 upgrade to a 2 ghz and slap the new HD on the new Motherboard and it work I have been told you get error after error.

The only other things I am thiniking if it doenst work is that its one of the following.

A) Virus in the Bios<---- Installed by the person I sold the PC to!
B) Processor is taking a shite!
C) The motherboard took a zapp and is now acting like HAL2000k

Any of you guys have an answer here id appriciate it.

Cheers KO