my computer can't read my saved files on some of the CDs?

Has the CD been closed? There's some files that won't be able to be read on a normal CD player, and will only be read by a writer, until the CD is closed off.

You need to be much more specific. What kind of files?

they are just some picture files.

the strange thing is that i also saved them on another CD, the computer can read some pics from that CD. this CD has no scratches, etc. but the computer cant' read it at all.

i think that you are probably right, it is not a closed CD. but how can use a regular CD recorder to read my unclosed CD? is there a program for that?

The software for CD writers normally detects the state of the CD and asks what you want to do when you try to eject it.