My Rig: AMD 64 athlon x2 4400 2.4 Ghz Dual Core 4GB Corsair DDR2 800 (PC2 6400) EVGA nVidia 9800 GTX+ 450W Corsair psu nforce 430 mobo 350 GB SATA HD Vista Home Premium 32 I've run memtest86, all is well. Temperatures are right where they should be. It almost seems like a driver issue, but Ive downloaded all the most recent patches for the games and the most recent video card and mobo controllers, but no luck. It also did this prior to me upgrading from the integrated geforce 6100, 1GB ram, and 250W no-name psu. On a side note, the games Ive tried are COD 5, Assasins Creed, Oblivion, Fallout 3, C&C3, and Black & White 2. All crash religiously within 5-15 minutes, except B&W2 which at max settings and game version 1.0 us fairly stable [1-2 crashes to desktop an hour]. Dont know if that info helps. Thanks for any insights!

This may not be your answer, but trying the easiest first works for me. The attached gives a list of all Windows Vista compatible games. Again, this might not be your problem, but you have a good system so I wouldn't understand why they would not run. http://www.nerdden.com/windows-vist...

how did you monitor temps? i doubt your figures were really under full load. Most people either check the BIOS temp after the machine crashes and has time to cool, or use 3rd party software in windows in between stressing the hardware, when it's not really a full load either. how are your dust levels looking inside your case?

When I bought my computer, it came with windows vista whichI knew nothing about but learned nothing was compatiable with it. I had over 200 bux worth of games that I relinquished to my son in law in Iraq then found out that all I had to do was click on "run as administrator"...that seemed to work! Hope it helps.......

I would look at either temp issues or power. A 450 W power supply is pretty small to be running your video card.

"A 450 W power supply is pretty small to be running your video card" That PSU should be more than adequate. Corsair is one of the top PSU manufacturer's & specializes in units with single +12v rails. That particular model has 33A.