I got a new MS Trackball explorer over Christmas but the software was missing. Downloaded Intellipoint 4.1 and installed it. My old mouse (standard intellimouse)works fine (before and after the 4.1 installation) but with the trackball no pointer movement the buttons and wheel seem OK. The trackball is optical so no dirt problems. MS seem to suggest deleting the registry files relating to old mice, but I was curious since the old one is OK.
Any thoughts please.