Computer Resarts Multiple BSODs

I left my pc at my apartment on a thursday, came home the following monday, went to turn it on, and , nothing. Blank screen. I cleared cmos, still, nothing. I then tried my psu on another motherboard I had lying around to see if it was working, and, it wasn't. So, my psu went dead in the 4 days that I hadn't used my computer. I then plugged in my old spare whisper series 460W psu(ATX 1.0 i think) and got the system to boot up. Upon loading windows i was greeted with "windows did not properly load last time". So, someone turned on my computer, probably my roomates, and in doing so, they killed my psu.

I didn't mind too much..as I can just rma the psu, and hope nothing else was wrong with it. So, after using my pc for about 10 minutes, i get a bsod. I shrug it off, use it more, 2 hours go by, bsod. A different one. I used the pc for another day, and still more, random bsods. I decided i'd try my older hard drives, as they still had a copy of windows loaded on them, configured to my pc. They experienced the same behavior, bsods, random, and never at the same time. Regarldess of the operation, i could be idling, playing a game, whatever. I know my ram is ok, i ran memtest for 9.5 hours, and it completed 26 loops, all passes. I am curious if my power supply is just old, and is having issues in some manner. I can't test this theory until my new psu arrives.

What i did test last night, was removing my wireless adapter. After removing it, i booted the pc, ran 3dmark2003, 2005, prime95, the 3d programs for an hour combined, and prime95 for 1.5 hours. All the while i was running one instance of folding@home in the background. It only had one hiccup, when 3dmark2003 was first ran, i closed with an unexpected error. The pc didn't restart once, no bsod's, i even left it on overnight, and when i woke up, it hadn't restarted.

I also found a combination of programs that causes a blue screen. If i have xfire open, and i'm in a voice chat, and I play an online game, the pc will show a blue screen and restart. I can play games fine, indefinitely it seems, and i don't get a blue screen, but when I use my usb headset and a game, it crashes. The last time this happened, the bsod showed "driver irq not less than or equal", with a code of 0x000000D1, and suggesting tcpip.sys is the culprit, upon restarting and logging in, as the system was loading drivers/startup programs, i ran into the same error, only it listed ntfs.sys...at least i think that was the file. Regardless, I think i'm having an irq issue. Can i have a driver irq problem? and how to i fix it.i've only got two pci slots, and i've tried using both.