Okay. Here's what's been happening to me over the past few weeks:
At first, Windows would randomly crash while trying to run the game Empire Total War. it's been known to cause problems on windows 7 so I wasn't too surprised.
Then, it began BSODing on me, which is more odd.
Then, it began to BSOD on me about once every day or two days, weather or not I was running Empire Total War, but more frequently if I was.
Very recently, windows began crashing several times a day, but worse, it wouldn't always boot up at first. BIOS would post and the BIOS logo would show up, it would read the RAID, but instead of booting windows I get the No Boot Media screen
Time and Time alone seems to get past that. I could reset and at first it would reboot instantly, but now more and more it does not work, or only works after a certain amount of time has passed.
Also, strangely, now BIOS will only recognise the RAID about one fourth of the tries on the attempt, and generally not immediately after a BSOD.
I'm stumped as are my technically inclined friends. it's getting less consistant in it's behavior and has gotten to the point the system is completely unreiable, but not in any reliable way other than now I can't reboot and expect to get back on within half an hour.
EDIT TO ANSWER COMMENTS
Video card is nVidia 9600GT. I sometimes monitor my CPU temp, I can't monitor the rest. I thought it might be heat, so I took a can of compressed air and blew out a LOT of dust, and some of the fans looked a bit jammed with dust bunnies, but it's clear now.
It's a RAID 0 array set up with 3 320 GB SATA harddrives of different manufactuers--I don't remember them offhand, and the build in intel RAID controller in a p5b delux wi-fi edition Motherboard.
The computer was built peicemeal from parts ordered from NewEgg.com, which have been upgraded over the years. The Motherboard is as listed, as are the harddrives. the Processor is a 2.93 Intel Core 2 processor (about a year old), 4 GB Corsair DDR2 RAM (2 GB RAM sticks). the video Card is about 3-4 years old, the motherboard and harddrives are about 5 years old. This configuration has worked fine for the past year or so, and I made no major hardware changes sinse installing the new processor.