DVD CD ROM does not read inserted disk

To verify that the CD is clean and free of scratches, examine the shiny side of the disc. To clean the disc, wipe it with a soft cloth in a straight line from the center of the disc to the edge. If there are no visible scratches, and if the errors still occur after you clean the CD, follow the steps in the "Test for a Damaged CD" section. If the CD appears scratched, try a new CD.

Test for a Damaged CD
To determine whether the CD is damaged: 1. Insert the CD into your computer's CD-ROM or DVD-ROM drive.
2. Click Start, and then click Run.
3. In the Open box, type cmd, and then click OK.
4. At the command prompt, change to the CD-ROM drive (this is typically drive E). To do so, type e: (or whatever the letter of your CD-ROM drive is), and then type the following command:
dir /s
If you receive an error message, the CD is damaged, or the CD-ROM drive cannot read the CD.

Tech steps to determine Faulty Drive
Check that all cables are seated properly on the Motherboard and CD.
Replace ribbon cable with a new one or known working.
Try another CD Drive.

http://support.microsoft.com/default.aspx?scid=kb;en;321641