Hi the first thing I might do is contact your Son to see if the photos are still on his PC.
If yes, Could He Email them to you? Or Drag and Drop (paste) them to Cd? Then post the Cd. Pasting them to Cd may eliminate a software problem.
Something to try though.. Right click the drive in My Computer goto PROPERTIES/ADVANCED Tab make sure 'Enable CD recording on this Drive' is ticked.
If your son used Roxio to burn the Cd. This could help. click here
I have got to say though.. I have no experience with this software and I don't know what downloading this program involves. I did searched for a free trial version, but can't find one ;-(