Hey everyone,
I find this very aggervating, sometimes i download a video and after like an hour of downloading it, it finishes and when i play it the video only plays like a little preview of the movie i just downloaded and not the whole thing. This keeps happening to me and is very aggervating when you download some thing and then it dosent even play the hole thing? Anyone have any advise?

Always use Bitzi to check a file before download. People use Bitzi to rate files...if the file's been rated then you'll get an idea of content & quality. It's very helpful with weeding out fake & misnamed & junk files. See the 'how to use Bitzi' link for info about downloading Bitcollider...so that you can rate files yourself.
If a file has heaps of sources but no Bitzi rating, chances are it's a fake. There's more info & tips in the threads below.
How to use Bitzi
Fake files showing up in search results
How to find music(tips for movies, too)

If a file has a good rating on Bitzi, or if you want to take a chance on an unrated file, preview the file after ~10% - 15% download...just to check.

Stay away from .exe, .rar, .wmv, .zip, & .mov files. Check file sizes...if a file looks suspiciously small then avoid it! A movie's generally 600 - 800 MB or larger.
mov files
What you should know about WMA Files(info about wmv as well)