VLC Media Player
Have you ever had trouble viewing your video in Windows Media Player? Have you had DVD's that will not play on your computer? If so, try downloading VLC media player. VLC is a free and open source cross-platform multimedia player and framwork that plays most multimedia files as well as DVD, Audio CD, VCD, and various streaming protocols.
To download the VLC player, click on this link.
Picture used under Creative Commons license from Flickr user Michael Hilton