Before messing around with video card drivers(maybe changing something that doesnt need to be changed) is there anyway you can hook up a newer LCD monitor to check if its still the same? if not then try and find out what graphics card/chipset the pc has, then google for the lastest drivers, download and install.

Im not saying it will work as i cant see the pc myself but i cant think of any other reason why this would happen on 2 monitors