What can i use?

I want to download a program kind of like ares/limewire .etc but i want one thats COMPLETELY SAFE because i just got a new and expensive computer and i dont want it harmed. I'm going on a roadtrip and i just want to download some movies to watch during the trip! :( or is there another/simplier/less risky way to be able to watch movies during the roadtrip (i cant get access to the internet on the road btw)