HELP trying to install 2 different vid cards 1 wont work

[VisionxOrb]

Im trying to run a 3 monitor setup. on my old system I was using my 6600gt and the internal nvida 6150 and everything worked fine. I just built a new conroe setup and im trying to use my ATI 1800xt and my nvidia 6600gt. My ati is working fine ( installed that first ) then I put in the 6600. The computer sees the card And I installed the driver but once rebooted when I enter the display properties it gives me a message saying that the driver was written for a previous version of windows and the current one cant be used. and on the 6600 it has a resolution on the monitor of -1 to 1. Ive tried 3 different versions of drivers starting with the latested but its still a no go. My ati is still working correctly.

BTW the mobo is a MSI 975x plat powerup. Both cards pci-e

 

[Lord Evermore]

I'd never try to run an nvidia card and an ATI card installed at the same time, at least not current ones (an older card with drivers built into Windows would probably be fine). Almost guaranteeing that there's going to be compatibility issues with both driver sets running. I can't help you but I'd bet money on it not being fixable.