I suggest that you uninstall all monitors again, and look on the monitor for the brand it is, and you should be able to find a model# of sometype got to the manufacture website and download the latest drivers for the monitor, so if its a samsung of course go to samsung.com or something. Also download the latest nvidia drivers from nvidia.com, they do have TNT drivers, DO NOT GET THE NEW DRIVERS FOR THE NEW CARDS! GET THE TNT ONE!
sorry for the caps, but its very important that you do that!
That should at the very least take away the horrible win98 style colors
yuck