You shouldn't have to open bit torrent (when it installed it associates itself with .torrent file types). Here's a basic walkthrough.

1. Find a torrent and download it (somewhere you can locate it like my documents or the desktop).
2. Once downloaded, find the torrent and open it.
3. Bit torrent should automatically open and ask you where you want to save the game to.

Watch bit torrent and make sure you get connected and it starts downloading. There may be issues if you're behing a firewall.

Are you on a network and connecting through a router (wireless or regular)?

Once it's done downloading, we may be dealing with the rar issue again, but let me know what torrent you get and we'll see what's in it.