Things you have to realize about p2p programs:
1) You can only get what is available when you search for them. Meaning, if you search for 'BlahBlah' and no one currently connected has this file, you cannot get it! Also, even if what your searching for is available from someone, you might not be able to get it...for any number of reasons. So try your search again and try to download another file.
2) Answered before...Movies are hard to get because they are typically available from only 1 or 2 people. This makes it very hard to get the whole file, especially when it's a movie that could be 800Mb or more! That is a large file and takes even the fastest internet a long time to download. **Also, if the person your getting the file from 'logs off' while your downloading...you loose the connection and can't finish the download. It's that simple.
3) Limewire is Not some massive computer somewhere with all these 'free downloads' in it. It is a million people all over the planet that have these files on their computers. You will not always find what you're looking for, at least everytime you search. Depends who is online and what they have.

Does that help???