Hey guys, thanks for all of your replies! As far as the process of elimination goes, I ran the system with its original RAM and still had the problem. I eliminated my slave 120 gig HDD, and still had the problem, I then removed EVERYTHING that the PC didn't need, so it was running ONE CD ROM drive, and the Primary HDD. I STILL had the problem! YAY! (I tried using different CD-ROM drives as well). Since I have installed the 32 MB card and reduced the hardware acceleration, I am starting to notice a pattern here. When I first boot up the PC (after being off for several hours), it will run for about 30 seconds, then crash. It will then reboot, run for about 2 minutes and crash again (did this yesterday as well) and now, being the 3rd time I've booted, it has been running approximately 15 minutes and appears stable. WTF???
I've also noticed at a "cold" boot up, that the monitor "flares" up, meaning its brightness and intensity will vary subtly, just enough to make me notice that it's going on. I also was wondering about the power supply, but it is rated at 450W continuous. However I am also running 6 fans on the machine as well (not counting the one built in to the power supply), one on the processor, 2 for the PCI cards,
one for the hard drives, one at the back of the 'board, and one at the top of the case. Could these be putting excessive straing on the power supply even though it's rated at 450W? I also unplugged 2 of the fans at first, but I again had the problem.
Note: This morning when I booted up it displayed "BIOS runcheck (or sumcheck) error", and prompted me for a floppy disk, I restarted, and it booted normally.
Is this info at all useful to you? I'll give any more information I can, but right now I'm going to download that memtest and get some sleep!