Blue Screen Crash and Reboot (FFXI)Follow

Okay. I'm gonna come here to seek advice since I can't seem to figure out the answer to this.

About 3 weeks ago, my FFXI game started crashing my whole system forcing a reboot. My husband and I ran safe mode and did a full virus and malware scan. Get back into the game and about two hours (maybe?) into playing, full crash and reboot. Nothing exactly wearing on the system. About the same as I usually have, but I decide to let it pass. I took about a week off from the game because family came to visit.

After the family left, I get into the game and every hour I get a crash + reboot. Frustrating, but I noticed that a few minutes before the crash I was having weird graphic distrotions. "AH HA!" I thought, "Video card." So we update my video card drivers. Well, about an hour, hour and a half after we update my drivers and I get back into the game, crash again. I'm fed up and give up trying to play for the night.

Get on the next day after a long day out and it crashes within 30 minutes of logging in. We have an extra computer that we took the video card out of and put it into my computer. It's a slight downgrade (very very slight), but if it fixed the problem, I didn't care. Well, needless to say, it didnt. I gave up (this was Saturday).

Sunday morning, I back up all my email, bookmarks, documents and to a fresh format and reinstall. I delayed reinstalling the game until last night. This morning I get on, check some things, log into my mule, log out of my mule and CRASH!

I finally made Windows stop the automatic reboot to find out the error (I know I should have done this first, but I didn't). I'm getting an IRQL_NOT_LESS_OR_EQUAL in my ntoskrnl.exe. Looked up what to do and several sites said to test your memory. I just got back from testing my memory for something like 4 hrs, with it coming up saying I have 0 problem sectors. So now I'm confused and don't know what the hell I should do from this point. Hell, at this point, I've barely even reinstalled half my programs that I normally use. So I really have no clue what is causing this problem. If anyone has any ideas, please let me know :(

Could be a heat problem. Failed fans, dust, things like that. It is rare for memeory to go bad, but it does happen.