have a problem with my mouse going out whenever I plug something into my usb ports. I reinstalled windows ME thinking it was something in the OS, but the problem persisted. I brought the computer in the shop because it is still under warrenty thinking it was a hard ware problem. They returned it to me saying it was a software problem ( not Under warrenty) and offered to reinstall windows for me for a hundred bucks. I took the computer home and put windows xp on it. The mouse was fine when I plugged a cable modem into one of the usb ports , but as soon as I plugged a scanner into one of the others , no mouse. Is this a hardware or software issue? Any Ideas on how I can fix this?