This is the Shareaza forum!

Try playing the movie with VLC player. It has codecs installed & can play most things. Choose the mirror site nearest to you for download. If VLC won't play it, then chances are it's a crap file.
http://www.videolan.org/vlc/

Is this just happening with the one movie, or does it happen with every movie you download? Are you using Bitzi to check out movies before download? Click on link below
How to use Bitzi
If a movie's been rated, you'll get an idea of it's content & quality. Files with heaps of sources but no Bitzi rating aren't to be trusted... they're often fakes