This post have a download link for iTunes
iTunes is a store, a player, and a way to get music and more on your computer, iPod, iPhone, and Apple TV.
iTunes is a total different program to the media player for Windows system, but it is also propular nowadays because most people in the world have an iPod, so this program is needed to manage and upload a special type media file (mp4 and m4a)
The only problem is iTune can not conveter to convert the video to mp4, you need to use an othe converter first then you can watch the video.
This forum have a converter which I think is very good to use for conveting the video file into mp4.
Go to the converter paot, link here:
Download link:
http://www.apple.com/itunes/download/