sound but no picture

I downloaded a movie using azureus and I tried to play through quicktime (tried Divx too) and a message popped up saying additional plugin needed. the movie has sound but no picture! Do I need a different codec?

Use a diagnostic tool to find out!
gspot: http://www.headbands.com/gspot
avicodec: http://avicodec.duby.info
videoinspector: http://www.kcsoftwares.com/?vtb