How do I download HD movies to iTunes to put in my iP4? I'm sorry if this is a very basic question, but I never had the need to watch movies on my iP4 until now.
You don't download movies to iTunes, you download them from iTunes.
Why do you want HD movies from iTunes on your iPhone anyway? They take a lot of space. SD movies already look great on the iPhone to begin with, due to the small screen.
For that you would need a digital copy. Which you can get from buying the DVD an blue ray bundle pack at a wal mart I think. Just make sure it comes with a digital copy. That's the only other way I can think of... By the way, toy story 3 is a great movie