I need help with BitTorrent! 10 points for the best answer!?

I downloaded BitTorrent because I couldn't find all of the Harry Potter movies in Ares. I installed BitTorrent and went to The Pirate Bay and got the torrent and when the download was complete, the movie automatically began downloading in Ares, not in BitTorrent. How can I change this? Is it necessary to uninstall Ares?