|Very odd indeed. If there was a specific driver that came with the mouse (on a disc or whatever) then uninstall it and re-install it.|
Otherwise, if the problem came along recently, I guess you could use Windows System Restore, although it would seem like taking a sledge hammer to crack a nut. Keeps your own stuff though - just type System Restore in Search and select a date before it happened.
Always pop back and let us know the outcome - thanks