Random Crashes?

Specs:
Asus P5N-E SLI mobo
Intel Q6600 Quad Core Processor
4X1GB Corsair XMS2 DDR2 RAM
Nvidia 260GTX (EVGA)
630W PSU (Raidmax Volcano)
570 GB HDD (2X Western Digital, 250 IDE, 320 SATA)
Windows XP 32-bit

I've been having countless problems with my rig lately. Most recently, I had an overheating video card that I THOUGHT was crashing my computer. I've just now upgraded, but I'm still experiencing crashes.

They appear to only occur when I boot a game. Only on a very rare occasion will it crash during basic use (internet and whatnot). However, I have tried playing Crysis (to play on my new card), and it starts and plays just fine. Right before it goes out I get a bluescreen flashed at me very quickly, and it proceeds to restart. On reboot I'm presented with "Windows has recovered from a serious error" message.

I have noticed a bit of a correlation, though. Apps I run off of my SATA hard drive appear to crash. While nothing usually happens on the IDE.

My temps are relatively hot, but have decreased dramatically with my new card.

Could this be a power problem? I find it weird that Crysis would run perfectly it it was due to the PSU... Any ideas? Thanks!

I'd agree that it might be the PSU, but like I said, it ran Crysis for an hour with no problems. If it was the PSU, I figure something would have happened there. I'm looking into a slot cooler to help me cool down a bit.

Another thing, the minimum PSU wattage for my GPU is 550W, so I think I should be fine...

research more and if no help try underclocking your computers gpu, see if that helps. if it does then its most likely your GPU power need at a normal state.

ok i've done research about your PSU, and other people and some of them that have your psu had a overheat problem with the 250GTS so i think you should get a different PSU maybe a 750W from like ANTEC or coolermaster. but still research

Naw, it's cooled down nicely since the speed's gone up. Like I said, it's not dangerously hot or anything. I'm going to go take a look into some other PSU's and whatnot now. Thanks for the help.

I'm not with the problem computer right now, but I'm going to disable the auto-restart and check the BSOD. Not looking forward to spending more money on another PSU, but I guess if that's what I need...