so i have been working on my cousins computer. the problem is when he installed the NEW drivers for his NVIDIA geforce 570gtx for the battlefield 3 beta it completely messed up his pc. Whenever he booted his pc up the computer would crash when windows tried loading and restart.

i installed an older driver and still same problem. wiped his hard drive installed new OS and still same problem with any driver for the 570gtx.

so i took one of my 470gtx and popped it into his mobo, installed the drivers and everything worked fine. played battlefield and stressed the card with no problems. So i thought it was his 570gtx at first. I took his 570gtx and popped it into my pc, installed the drivers and i could play games fine with his gpu. i EVEN ran stress tests on it and still everything was fine.

i know theres nothing wrong with his memory or power supply because i checked those out already.

anyone have any ideas?Compatibility issues are hard to resolve. One common problem is other I/O devices may use some of the same resources as the video card. Some sound cards can do this. Proper install sequence of the drivers makes a big difference.
After install of Windows, install the chip set drivers. reboot.

Next instill the REST of the recommended stuff from the motherboard CD.

Last, install the Video card and its drivers per the makers instructions. No short cuts. Example, one manufacture says you have to start with a VGA driver in place. Just the the generic one.  Turn off power. Restart the computer and cancel  the 'found new hardware' thing. Next install the Video drivers from the CD using the setup program on the CD. When all don, reboot.

In other words, read the documentation over again. In some cases the plug-and-play does not always work right on every machine. So the manufactures has you do it the manual install, using their install program instead of the windows plug and play METHOD.