Green square when trying to play downloaded clip

Hello,

When I am trying to play a downloaded torrent movie, the windows media player is opening and then only the sound comes with a green square. No pictures appear in the square. Just a plain green square. Under properties for the file it says, "Video Clip".

I updated the graphics drivers and also have the latest java updates. The funniest part is that in the same course of download there are other files which are playing perfectly. It's just a couple of them that are not playing.

Request you to please let me know how to overcome this trouble.

Regards.