Driver for optiplex 760 causing system lockup on boot

Hi all, I have just purchased a new optiplex 760 and am having problems with system lockups and automatic restart when the system is booted. I can get into all of the safe modes without any problem. I couldn't find out what was causing the lockup so I wiped the hard drive and started over. When installing the drivers one by one I discovered that  the video driver is the culprit. So right now i have a generic driver installed for the video card but it does not allow the correct screen resolution for our monitor so I need to find a fix. Any suggestions on where I can get a correct driver for this card? Is it possible that i have a bad MB or VC? we have several of these machines with the same configuration and this is the only one that has this problem.

Thanks