I one time reset the desktop resolution too high and it pushed things all over the place out of the viewable portion of the screen, out where I couldn't reach them. So another possibility is that the resolution needs resetting. Right click the mouse over any blank area on the desktop and go to "Properties." There are several tabs and the last one is "settings." Double check to see that there isn't a possibility to overshoot the actual pixel range of the monitor by going larger than 1280x1024 (or smaller, for a laptop). It has been a long time, on a much older system, but still, it's one more possibility. Good luck. Isn't long distance computer support such a thrill [not!]?

SRS