Okay long shot here can you open disk and right click and drag mouse to darken what you have on that CD/DVD and once darkened right click and right click and click send to -----Compressed (zipped) folder
It will complain you can't save it on the CD/DVD would you like to save it to your desktop. Click yes.
If there is actually anything there you have a better chance of cracking it open off the CD/DVD.
If you do try this post what the properties say the size of the zip file that should now be on your desktop.
It does kind of sound like maybe you used a CD formatted for music but put data on it and if that's the case that's why your getting the "Non-Allocatable List" but lets see.