My mouse has been playing up for a while. The cursor wouldn't stay in the same place for more than a few seconds then it would either start creeping slowly across the screen or it would make a sudden jump to a different position. Now it has locked up altogether and won't move at all. I've tried reinstalling the drivers and using a different mouse. I have recently downloaded SP2. The mouse was working erratically before I did this, now it has gotten worse. Obviously, SP2 isn't the whole of the problem. Could it have made things worse, though?