Well... I'd bet it has something to do with the condition of the CD. Either it's scratched or something to that effect. If you have another CD or DVD drive, make sure you try the CD in both drives. That fixes most of my problems for some strange reason.

Also, if that doesn't work, what I would try next would be to get a program to copy the CD image to your hard drive and make a virtual drive to mount it on. That would most likely work as well.

What is it they say about silence being golden?