Replying to Digital Download ----> HDTV Help!

Hey guys so i just downloaded The Grand bizzare from itunes in HD. This is the first time i have done this so mind my stupidity. I want to watch the movie on my tv. So, my TV has VGA import on it but from what i understand this won't be playing in HD. My computer does not have an HDMI. Is there any way to some how get my Itunes movies onto my computer in HD?

I have already tried copying the purchase onto my memory stick, and then plug it into my XBOX's USB port. But itunes has some type of block on the file and wont allow me to play.

Any way to by pass this?