Verify that the CD is not smudged or scratched.
During normal usage, the CD surface may become smudged with fingerprints, dust, or other particles that prevent your computer from reading the information on the CD. Even a small smudge can cause your CD to experience problems that may lead to lockups or program errors. If you were previously able to run the program, a smudge or scratch is a likely source of the problem. Clean the CD with a soft dry cloth. After cleaning the CD, try running the program again.