My friends win 98 rollerball mouse wanders slowly when the mouse is at rest and is jittery when selecting. He had an earlier mouse with the same problem, As he inherited both, together with a rather old pc, and knew nothing about cleaning, I suspected dirt was the problem (this was also sugested on another thread which has been tainted by a twit.) I have thoroughly cleaned his present mouse but it still wanders. His son recently gave him a new optical ps2 compatable wired mouse which he tried, but got a 'no mouse connected' message. Shouldn't there have been a disc with the mouse? any ideas please.