The K-Lite Codec Pack is a collection of DirectShow filters, VFW/ACM codecs, and tools. Codecs and DirectShow filters are needed for encoding and decoding audio and video formats. The K-Lite Codec Pack is designed as a user-friendly solution for playing all your audio and movie files. With the K-Lite Codec Pack you should be able to play all the popular audio and video formats and even several less common formats.
This is 100% free software, so enjoy! My Recommendation, download the Mega and when installing it, uncheck the Windows Media Player Classic. Then, for the final setting, check in association with Windows Media Player. Yes! Finally you can play any format of video/audio (mostly) with WMP.