It should come to you after the first couple of downloads that maybe, just maybe, these Files are either Fake, Corrupt, or Spam.
Delete these Files at once. Now Try Bitzi before You download ANY Video File. See Instructions Below.
After you have completed your search, Right click on the file that you're interested in. Now go to Advanced > Lookup File With Bitzi. Left click on that and a new browser window will open which is Bitzi. Now you will see how other members have rated this file. If you see something like "Bitprint not found" then Leave it alone. Its probably a Fake or Corrupt File. If it has been Rated then you can read what or how the members feel about the file.
Don't take offense, Just be VERY Carefull.
And
to the Gnutella Forums.