Any PC with an internet connection can download movies.
By far the best way to go is to download from what is know as Torrent sites. Each file you download is caled a torrent.
First of all you will need what is called a torrent client, which is a piece of software that allows you to connect to other users and download files from them. I highly recommend BitLord. Download it from
http://www.bitlord.com/download.php.Choose verion 1.1.
Next you need to go to a torrent website, and these basically show you all of the files the you can download.I find one of the best sites is www.mininova.org, or www.isohunt.com. For best quality movies look for the text R5 or DVD in the title. Any movie with CAM in the title means that it was shot in a cinema with someone holding a camera. The Cam ones are often of very poor quality, but you often find other users leave commest as to its quality, so always read any coments before downloading.
good luck and happy downloading.
PS, I should point out that downloading copyrighted is completely illegal.