Do the files look the right size? Did you check the files with Bitzi before download?
How to use Bitzi

Which players have you tried to open the files with? Are you getting an error message when you try to open the files? Have you tried VLC player? It's a free download & has codecs installed to play most file types. If you haven't tried it - give it a go. There's a link for download in this thread: http://www.gnutellaforums.com/tips-t...p3-fixers.html

If VLC won't play the file, chances are it's a bad file. Check the thread below for some more info & tips.
How to find music(tips for movies, too)

Also some helpful info here: Fake files showing up in search results