Thanks to each of you who replied to my question about the Logitech Optical Mouse. I have uninstalled the mouse and the keyboard, and tomorrow they will go back to the store. Once they were uninstalled, the Start Menu came back as before and things are OK again. Thanks again.

You did push the little button on the bottom of the Mouse so that it communicates with the receiver? I have had one for over a year and really like it. Walt Conner > Thanks to each of you who replied to my question about the Logitech Optical Mouse.