Hi Sara, Please only Post once. We are all Volunteers here so we will get to you as soon as possible.
Now, AVI files are what you want to look for. Use Bitzi to see how the files are Rated.
This is how it works. 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.