Which player are you using? Have you tried using different players? What format are the files that won't play?

Try VLC player. It's free & has codecs installed to play most file types. Check the thread below for a link to download.
http://www.gnutellaforums.com/tips-t...p3-fixers.html

If VLC & other players don't play the files, chances are that they're junk.
Check the thread below for more info.
http://www.gnutellaforums.com/downlo...tml#post335783