yeah maybe the mouse is defective.. but why is it when I plug it in the 3rd USB port it works perfectly, only in the other 2 ports it wont work. I check it in device manager it said error 43, its a common problem in windows 7 as i have also look at google.
Ive done already:
1. uninstall all the drivers in USB port then restart to allow windows to reinstall
2. remove the battery then wait for a few minutes then restart
as i have seen this advice in other thread, forums.
im still using it now and it works fine, but it is plugged in the 3rd USB port in the left side of my laptop.. but its little messy since i have to use longer cable.. my optical mouse cable is retractable so its more convenient in the right side of the laptop's USB port so there will shorter cable to use.