I had to reinstall a program and the CD must be scratched bad enough to lock up the computer. Tried it on six computers and all the same thing. Tried polishing and NG.
Found on the internet that trying to copy the CD might work even if the CD won't work. Sounded kinda crazy, but in my mild panic I decided to give it a try and.........
*** It Worked!!! ***
I made an image file then burned a new disc.
Hope this helps someone.