I didn't get what you are referring to. If you mean you need torrent download client then use Azureus, best torrent download client out there.
If you referring to playback of video files then install:
FFDShow Codec
and then install one of the following playback software
BSPlayer free version or
Core Player
That will slove all playback issues with vairous video types. FFDShow can do all video types.
Edited on, March 23, 2005, 7:02 AM GMT, by Nasif.