A friend using Windows 98 SE all of a sudden has had his mouse pointer disappear. The system has not frozen as he can press CTRL, ALT and DEL and get the Close Program window to open. A couple of times, the pointer has reappeared after a few minutes but then it would disappear again. He has changed to a different mouse but the same problem occurs. This happens after about 5-7 minutes. Any suggestions as to where to look?