My Windows XP Desktop display has suddenly - and unprovoked - gone to the lowest resolution instead of the highest where I normally have it. Control panel then Display then Settings will not let me change it. I've tried System Restore but that does not work either. When I boot up, the boot-up screen is normal as is the Windows XP loading page but Welcome and the Desktop are in Lowest resolution. My computer's back-up CD is a 2003 version of XP and so I may have to resort to this and lose stuff. All ideas welcome.