LW isn't a very good torrent client. For torrents I'd suggest either
uTorrent or
Vuze (formerly Azureus). They're proper torrent clients & both are free.
But regardless of which client you use, check comments about the torrent before you download it. Torrent sites have the option to view comments about the file - so that you can see what other users think of the file & if there are any problems (such as being incomplete, misnamed/porn, infected etc)
And if you're downloading files from the Gnutella network (rather than torrents), always check the file with Bitzi before download. Click here for more info:
How to use Bitzi
If the file has heaps of sources but no Bitzi rating then I'd stay away from it.
You can also preview the file (say after ~10% download) to make sure that it's what you want. If the file looks bad or has been misnamed then kill the download & you haven't wasted too much time or download allowance.