Checklist:

1) You can not do anything with .torrent files, they will only lead your bittorrent client to download the actual file, say an .AVI file

2) Once you have a readable format, (I'm assuming this is a video file) .avi, .mpg, .wmv, .ogg, etc. Then you have to find out which codec it is compressed with.

3) Best thing to do is download the program <a href="http://www.headbands.com/gspot/">GSpot</a> and open the file in it after installing

4) It will tell you what codec you need for the video and what codec you need for the audo

5) <a href="http://www.google.com">Google</a> search them, download and install them.

6) Watch the clip.