Tony,
I don't know anything specific, just a few steps that have worked to solve most of my driver issues in the past. FWIW:

1. Switch your driver to VGA. Reboot.
2.Uninstall old Nvidia drivers from the Control Panel. Reboot.
3. Start to safe mode. Install Nvida driver package. Reboot.

I think you're right about the monitor .inf file though. Have you gone to you monitor's mfg. web site to download thier most recent .inf files?

-Zeke