How do I put a video together using small scenes and clips from other youtube videos?

I wanna make a video of clips of hannah montana. I wanna get like different words to make sentences, if you get what I mean. How do I youtube flv downloader get the videos from youtube onto my windows movie maker?
Go onto www.onetruemedia.com download flv youtube and add those files you downloaded, and you can edit. You can add songs, and annimations. Its a good program to use.