Have a look through these 2 threads
Fake files showing up in search results How to find music(lots of info applies to video as well as music)
Just be aware of what file sizes you should expect...a movie's roughly 600-700 MB & a TV episode's roughly half that size (depending on the length of the show). 1140kb & 8MB are just not right
Make sure that you use Bitzi to check video files. Also make sure that you have a good, up to date AV program & that you scan downloaded files before you open them.