How would i get clips from disney movies that are on the computer and make them into a video?

My fiancee and i want to play a video of all the Disney couples dancing as well as pics of couples that'll be at our wedding. So i sorta need to know how to get the clips offa the internet. If anyone can help, we'd be really grateful!|||look up how to download them and then (if you have windows movie maker) you can drag them there and put them together =)