My sister is having a problem with her computer. Whenever she starts up the Windows XP user welcome screen. the mouse is stuck at the center of the screen. I have had this problem before on computers in the past and the solution was to keep restarting it (holding down the power button) and then after a few tires it would work. We have done it many times and I've even replaced the mouse but it won't move. Does anyone have any suggestions? All and any help would be greatly appreciated.