Can i download movies not purchased through itunes

From where are you getting these movies, or are planning to get them?

Sorry, but if you're referring to commercial and hence copy-protected video DVDs, breaking the copy protection, which would be necessary to copy the videos from the DVD and convert them, is illegal in the US (and other countries) and hence Apple explicitly forbids such posts. We're therefore not allowed to discuss it here. Some DVDs and Blu-Ray movies come with a "digital copy" that allows you to download a copy of the movie for use on computers and portable devices. You might see if any of the DVDs you have come with such a feature. Walmart/Vudu also has a service that basically gives you a digital copy of a DVD you already own. See:

http://www.vudu.com/disc_to_digital.html

If these are home movies that you or someone has burned to DVD and hence are not copy-protected, Handbrake (freeware) is one of the more popular converters. Once converted, you just drag the movie into the iTunes window on your computer.

Regards.