K-Lite Codec Pack
K-Lite Codec Pack
http://www.k-litecodecpack.com/
XP Codec Pack
Xp codec pack is one of the most completed codec packs which helps you to play all major audio and video formats. and... to enjoy your multimedia experience, instead of 3 or 4 different players you get one, simple integrated player that plays almost all audio and video files: media player classic.
http://www.xpcodecpack.com/