There are alot of fake files about at the moment, especially with something that is popular...
You may need to select a file from a lower number of sources..
Or wait a day or even a week or two...

Try using Bitzi, its a very useful site...This thread will explain to you what it is and how to use it....
http://www.gnutellaforums.com/open-discussion-topics/37676-how-use-bitzi-web-lookup-how-use-magnet-links-direct-connect-browse-chat.html