I'm under the impression (and someone please correct me if I'm wrong), that you can't take screenshots from films?
If this is true, the way you'd have to do it, would be with something like Paint Shop Pro... It has a feature called "capture". You'd pause your film at the moment you'd like your screenshot, "capture" it, (it'll go straight to Paint Shop Pro), resize to fit paper and print it from that...
I'm sure someone else has an easier/better solution, and I'm not even sure you can pause the darn film either...