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.
An update is available for version 4.7.5 of the codec pack that upgrades it to version 4.7.7. The update pack includes a newer version of ffdshow. This update fixes a problem that could cause a crash in WMP and Media Center.