This happenned to me friend sometime back too. I don't know what happened to the mouse, but since it came with a ps/2-to-USB converter, he connected the mouse using usb and he is using it like that ever since. It's not a permanent solution ofcourse, but if u have a free usb slot, you can try this.
__________________
http://myxp.blogspot.com
-----------------------
Winchester 3200+ @2,500MHz
LeadTek 7900GT VOLT MODDED @ 680 core, 1800 mem
2x1GB Transcend DDR400 @ DDR454 2.5,3,3,5,1T
|