Check each song plays ok first. It would only take one bad file to cause a burn to fail. Make sure all such songs show up in WMP's library.
http://www.gnutellaforums.com/tips-t...tml#post344530 (except from page 2 of that thread.) You could try burning to CD-RW first, to save disks. Although CD-RW will not play on most CD players, they will play back on your computer (& some DVD players can play CD-RW audio disks.)