My Itunes won't download a movie i bought.

Hello,
please help, I downloaded 'the hangover' off of itunes yesterday and just as it was downloading but laptop ran out of battery and hibernated, I turned it back on but the download of my movie had stalled, at the bottom of the itunes window a message said '1 itunes download available' I thought that if I clicked that it would resume its downloading, but instead about 4 different stalled versions came up on the downloading screen, and it hasn't worked at all,
thank you for your help
Kaye.