Stay away from the files with huge numbers of sources, they're probably fakes. Go for a file with 10 sources or less. Check out a movie before download with Bitzi
How to use Bitzi

VLC is a good player, it has codecs built in & will play most things. To preview with it (if you use Windows), you'll just have to open your incomplete folder from outside of LW. There's a link for download below
Codecs & VLC