I updated PC with linksys driver update via MS Windows Update and the PC ceased to function normally. Just got a black screen. When I tried ti do a system restore, all went black again. At any rate, I did a complete system restore and reloaded all I needed. Somewhere along the way, the USB port extension went dead and the mouse began to act erratically. By that I mean the 'right click' ceased working but the 'left click' works only to the extent that the selection bar appears; I then click 'open' and the selected item appears. I tried two other mouses (that work fine with my other computer) and the same thing occurs. Also, even though the Device Manager window noted that the mouse was working properly, I ran the 'repair', 'uninstall' and 'reinstall' functions, all to no avail.

Any suggestions?