Windows Media player 11: Windows Media Player 11 for Windows XP offers great new ways to store and enjoy all your digital media. It's easier than ever to access all of your music, videos, pictures, and recorded TV on your computer. Play it, view it, organize it, or sync it to a portable device for enjoying on the go, or share with devices around your home—all from one place. Click here to download

Quicktime Player: Export content to iPhone, iPod, and Apple TV. Capture movies and share them easily with your friends and family. Encode with the new H.264 video codec for exceptional quality. Click here to downlaod quicktime player

3gp player: 3GP Player 2007 is a Free 3GP player for your PC. Supports all mobile phone video formats including 3GP, 3G2 (3GPP2) and MPEG-4, most of the video and audio codecs are supported. Now you can watch all your 3GP videos on your PC with this free and easy to use program. Click here to downlaod