I downloaded the 2001 Ford Service Manual CD for my Mustang GT and Can't seem to get it to work right. When I run the program I can see the menu titles and buttons, but anytime I click on something it tells me I need to insert another disk. I erased the whole program out of the computer, re-downloaded it and it still tells me to insert another disk when I use it. Has anyone else had this trouble or know what might be going wrong here? Please help.