try to ge into a private site with DEDICATED uploaders, where are you getting this file from? how many seeders/leechers? Are they sharing to you? Are your ports forwarded? Did you cap your up/down limit too much? is your isp bittorent friendly? are your hardware/software firewalls allowing utorrent? and lastly what version of utorrent do you have, beta?
also dont use anyhthing above utorrent 1.6 that includes 1.6.1, after version 1.6 MPAA bought bittorrent.com which was owned by utorrent and designed the CODE for utorrent so try to get 1.6 if you can unless you want your utorrent showing everyyone what your downloading/uploading