How can I make a video in slow motion?

I have a video of my friends on a roller coaster, and I want to make the part where the ride starts in slow motion, because their faces looked hilarious.

I have Windows Movie Maker, but I couldn't find a way to do it on there, so can you recommend any other programs I can download to do this?How can I make a video in slow motion?you can do this by using adobe premier. just load the video in video track and right click goto speed and turn the speed down. i think the default speed is 100, change it to 90 or whatever you want.How can I make a video in slow motion?you can do this in windows media player. under video effects drag "slow down: half" on to the scene in question. do this again for 0.25x, and again for 0.125x