A new version of the codec pack has been released with several updated components. New in this version is an option to choose to use an experimental MT (multi-threading) build of ffdshow. Advantage of that build compared to regular ffdshow builds is that it has better decoding performance for H.264 on CPUs with multiple cores.

K-Lite Codec Pack is a collection of codecs and related tools. Codecs are required to encode and/or decode (play) audio and video. The K-Lite Codec Pack is designed as a user-friendly solution for playing all your movie files. With the K-Lite Codec Pack you should be able to play 99% of all the movies that you download from the internet.

• It it always up-to-date with the latest versions of the codecs.
• It is very user-friendly and the installation is fully customizable, meaning that you can install only those components that you really want.
• It has been very well tested, so that the package doesn't contain any conflicting codecs.
• It is a very complete package, containing everything you need to play your movies.

Download this file at K-Lite's website.