first thing to do is boot the computer with a DOS boot disk with mouse suppport.

if it works in DOS boot to safe mode :

open device manager and remove the mouse..
open regedit - locate the [Enum] Key (HKLM\System\CCS} find your mouse in the devices and delete it.

go to {HKLM\system\CCS\Control\Class) look for the mouse under the "0000", "0001" keys.. (i don't remeber which category has the mouse.. )

if you find it - delete it..


Reboot your computer.. windows should redetect your mouse and reinstall it.

Keep us posted..