Ok, now I'm getting pissed. About two weeks ago, I had a bad computer crash that resulted in me loosing a lot of data. I reformatted the drive and reinstalled windows XP. About a week went by and I started getting tons of errors on start up. If I got into windows at all, multiple programs would shut down on me, like explorer and messenger. Most of the time though, at the logon screen, I'd get an lsass.exe error and it would restart.

Well, I heard that can be caused by updating windows when service pack 2 is missing or damaged, and my windows disk is a burned copy that I slipstreamed with service pack 2 so that I could use all 300gb's of my Seagate hard drive.

Anyways, I use my old xp cd, update to SP2, and carefully update my computer.

A day goes by and all is well, until I play Half Life 2. At a random point in the game, the PC crashes and I have to hard reset. I do that and go get something to drink, and am greeted by a BSOD. Every time I restart windows now, it gets no further than the progress bar and proceeds to give me a completely different error every time. Among these are...

STOP: "Bad Pool Caller"
STOP: "Driver IRQL Not Less or Equal"
STOP: "0x000000ED Unmountable Boot Error"

I was not getting these errors with my old hard drive, but no longer have that. I'm wondering if this is a memory error, since one of my sticks wasn't working in a friends PC, but worked fine in mine upwards of 3 years now.

Any advice guys? I've reinstalled XP like 3 times now in the last month and I'm starting to lose hope. Hardware Problem? Software? Totally lost, and kind of wishing I had the money for a Mac.

Thanks in advance guys.