contr?´le de redondance cyclique ;)
we've been talking about that recently on another (french) forum:
http://www.frigorifix.com/viewtopic.php?t=3336
to sum up, the CD has been badly burnt or damaged and the disc drive can't read it correctly
sometimes reading on another drive can allow you to copy the files on your hard drive, then it's a good thing to burn another copy
someone proposed a link to a software that could solve this kind of problems too.