it depends what file format is and wat your watching it on,
say u have downloaded for e.g
"film.avi" then you try to watch it on "windows media player"
the .avi format is not supported by windows media player
if this could be the problem then try downloadeding a piece of software called vlc player this might help and is a great and better version of windows media player.
hope this helps,
chris4corrina
