There may be several fixes, and I doubt rescanning would be the
   slightest bit necessary.

       1. Check the jpeg format in a photo editing program. Baseline,
   baseline optimized, progressive? 36 bit? 48 bit? It's possible your
   player can read only one type and you have several.

       2. Clean the CD surface, and use a lens cleaning disk on the
   player. Dust and minor scratches can be enough to thwart some
   players, as can humidity.

       3. Reburn the CD, and when doing this, I would suggest downloading
   all the photos and creating a new CD "image", *not* simply doing a
   full copy of the existing CD. Some of the older burning programs are
   too screwy with newer players, or you may simply be having a CD
   failure as well. Plus this may get you past minor scratches that
   your computer can muddle through but your player cannot.

       4. Save all the photos to computer, and resave them under a jpeg
   compression/format that you've already tested with your own CD
   burner and the new player. Irfanview, for instance, is free and will
   do batch processing into another folder, allowing you to keep the
   originals while creating new versions. You may simply be looking at
   images saved by a program that was less than ideal (or by someone
   who failed to heed the warning to close all other programs before
   burning, which *is* a serious issue).

       Failing all those, and also being unable to even read the images on
your computer, you may have to rescan a few - probably not all.

       Good luck!

    - Al.