what client did u download. bittorrent works by having all clients serve out the parts o fthe file they have. its file sharing..well the way it should be. course if there are no seeds, then everyones sharing something that can never be completed. so once ur done, don't just leave, share atleast a little while or else the network collapses. it relies on the goodness of people... which can be its downfall of course. i've seeded the damn thing a couple hours a day..and when i leave... it seems no one else stays as a seed ever. im' back, but be warned, i'm slow.
i use abc torrent. google easy. u can limit upload so it doesnt floood u