I've been using 7-ZIP to join files. It’s free and works great, haven't had any problems with it. Here is a link to their home page 7-zip.org/

I finally got those damn cats figured out at Rapidshare. You have to be sure that each letter has a cat with both the face and tail. You may need a magnifying glass to see them. It was well worth the frustration, the movie is fantastic.