Radom Reboots and blue screens! Please help!

I just bulit a new system and I am having major problems with it.
Specs First:
Amd Barton 2500 running at stock speeds 1.8 gigs
512 mb of Corsir ram running a stock timmings
200 gig maxtor hd with 8 mb of cache
K72NG mobo using the Nvidia drivers
480 wt Antec ture power PSU
Win Xp Pro no SP installed.
Ok heres the deal. As soon as I got the PC up and running and Xp installed on the HD, I went to nvidias site and downloaded the latest drivers. Installed those and thats it. Things where going ok for a while then I started having random reboots. Even when the system is 100% idle it just goes to a black screen and reboots. Same thing that hitting the reset button would do while in windows. It started happening more and more. I first thought it was my power supply. I was using a 400 wt raidmax at that time, but I checked and it had the specs of a 300 wt psu so I thought that might be the problems. After reading a review of it, they reported having some random reboots with chips that were around 1.8 gigs which is what mine is. So I ordered a 480 wt Antec ture power PSU. I installed that and I still had the same random reboots. So then I ran prime95 to test the memory and cpu. Prime would get a error after about 3 sec. So at this point in time I was thinking it was the memory. Before I tested the memory I reinstalled XP over it's self to save my programs and to see if it was just a bad install. It randomly rebooted like 40 times during the install casuing it to take about 4 hours. Once it was reinstalled the random reboots were still happening, but not as often. I am not getting fatal blue screen errors. They all appear to be memory releated. So at this point I took my pc over to a friends house and swaped out my memory with his. We noticed that XP was reading both of our memory sticks as only 480 mb and not 512. We thouhgt if it read it as anything it should be 524mb. In any case we put in his good, working memory that we knew worked fine. Same things, blue screens and programs having to be shut down due to errors. I am now at the point where I have no idea what it could be. I DO know its not the PSU and Memory sticks. I am also pretty sure the CPU is fine. And yes its cooled fine and the HSF is installed right. So I am lost and really need some help, my pc is total un useable right now. I am going to E3 this week and will have a TON of stuff to do when I get back. Any ideas would be great.I really need to get this fixed ASAP. The only thing I can think of is maybe I have a bad mobo. Or some how my XP install is screwed up. The last thing i will try is installed XP on a new 20 gig hd and seeing if that will run. Anyone here have any ideas on what the problem could be and how to fix it?

"then look to your cooler
the other 32 mb of ram is what bios has allocated to your vga card use by the way "
Ahh yes forgot about the onboard gpu. But dude, it's not my cooler. My temps are fine I know how to install a HSF and I have the best one out there. My CPU is cooled damn good.
"it could still very well be some type of memory errors....try setting fsb @133 and memory at fsb/dram 1.1 all timings manual 6/3/3/2.5.....give it ago....if it works underclocked then it is still memory related."
Even when I swaped out with a diffrent stick of ram that we knew was working? I am not using cheap ram btw, I am using high proformance ram running at stock speeds :( FSB is set at 166 right now, the only setting I changed on the ram was running it at cas 2 instead of the bios default 2.5. I think the timings are underclocked right now, will have to check when I get home from work since I do not rember what I set them to last exactly.

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Although you don't specify your Mac, it sounds like you have real HW problems, likely the HD.
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