well, you downloaded the movie to your computer? the videos can play with itunes and ipod are specially supported.
you need to convert the formats for them first. Maybe you can get some videos conversion tools to have a try. i used to use
video converter pro from ifunia on my imac, for windows i recommend
aneesoft to you. this two are not bad, whether the speed or quality. you can have a try.
hope to do some help for you!