I have computer that has windows 98 on it. The other day the user explained that they couldn't click on anything from the desktop. Double clicking has gone out no matter where you are on the computer. I have used a different mouse and no luck. If you single click it it highlights, but does nothing to open if double clicked. I can right click and go to open and open things. Does anyone know what has caused this and how it can be converted back. I ran virus scan with no luck on finding any viruses.