I'd try using a CD/DVD file recovery or extraction utility. ISObuster is one I've used successfully in the past but I'm not sure if the current down-loadable version is trialware or not. It may allow you to extract the corrupt files from the CD and then you can use the other program to try to fix it.

www.isobuster.com

This program is free and may be worth a look..

http://www.snapfiles.com/get/cdrecovery.html