Sony DVD RW DW-Q120A disc issue

I have a Sony DVD RW DW-Q120A Problem and my wife made a slide show disc from a memory card not too long ago. I can put the disc into any dvd player and it will play just fine. I can put it in my computer, and it is fine until you try to open the folder with the picture files. The error message says the files cannot be found. But if you disconnect the sony from the computer, it can read the files just fine! WTF! is there any way to transfer the files back to the memory card from the dvd in the sony, or some other way to access the picture files from the disc?:a

Try to copy the whole disc onto another one (Verbatim eg.) by using Imgburn.

Maybe also the files on the disc are HIDDEN and you have wrong settings in explorer!