BitComet is a Bit Torrent client. Many sites have banned BitComet recently due to a major bug. If you want to enter the BitTorrent world, you could use Azureus, Shareaza, ABC or utorrent. You will need to find the home page of one of those, download and install the client. Azureus uses Java which can cause trouble on some computers, although it works fine for me. BitTorrent also requires that after you've completed your download, you let others leech off you for a while. It's a good system as long as you give back what you took.