I'm guessing you've saved a torrent file to your PC rather than actually downloaded the file. Basically a torrent file is like a flag for where your PC should put the file once its downloaded. Because its a peer-to-peer transfer system it might take a while but what you need to do is get a form of BitTorrent (either BitComet or Azereus if you have the RAM for the latter). If you have enough Seeds it shouldn't take too long.
If on the other hand you've already done all this you're probably just lacking a codec file. If Cyberbeing hadn't deleted the thread on it I would point you to that but seeing as he did, I'd say search on Google for the 'Combined Community Codec' pack, that should have all the latest codecs you'll need to play avi, mkv and ogm files.
If none of that works, come back and ask again. Don't forget to tell what you did and what's not happening.
By the way I'm not an admin, but I should be!
