LW mods can't delete any files from the network
You're downloading from other users. Files that are being shared by Gnutella users (on their computers) are what you'll see in your search results.

If the video you're trying to download is a new release, or really popular, chances are that a lot of files being shared are spam/fakes. If the video's still in the cinema & hasn't been released on DVD yet...at best you'll get a shitty cam version. And if it's a very rare file, it might take a long time to find a good source.

Check out these threads for some info & tips.

Fake files showing up in search results
How to find music (tips for video in here as well!)
Movie download issues