My Windows 98 was working fine until I let someone use it in my absence. Now my mouse pointer is no longer pixel-accurate.
It jumps 2, sometimes 3 or 4 pixels at a time no matter how slowly I move the mouse.
Furthermore, as I move it around the screen, it "wobbles", and a ghost image appears in front and behind the pointer. The faster I move it, the further away from the real pointer these ghost pointers move. Moving fast diagonally, a ghost image of a pointer follows the real pointer, which is preceded by another ghost image which wobbles violently left and right.
* I have since bought a MS Intellimouse with wheel and installed the Intellimouse software but to no effect.
* I have checked and MOUSE TRAILS are NOT on!
* I have tried re-installing Win98 over the top of my existing installation. During the setup screens the mouse operates normally but after setup completes it has the same problems.
Short of a complete re-format and re-install, what can possibly be wrong?