Recently was released K-Lite Codec Pack 8.0.0 (aka K-Lite Mega Codec Pack 8.0.0), one of the most popular codec packs.
K-Lite Codec Pack is a collection of codecs and DirectShow filters that allows you to run any video or audio file. This software interface is very intuitive and can be used even by inexperienced users.
K-Lite Codec Pack - key features:
This allows you to run audio and video files in any common format. Codecs included in K-Lite Codec Pack can be used to create your own videos. There are also plenty of tools that can help create or edit them: subtitling tool, bitrate calculator, splitters, etc..
K-Lite Mega Codec Pack 8.0.0 - what's new?
At this version of K-Lite Mega Codec Pack was removed CoreVorbis and had implemented a few updates: Codec Tweak Tool was rised to version 4.1.0, MediaInfo Lite to version 0.7.51, ffdshow was updated to version 1.1.4070 and LAV Filters riched version 0.40 build 2011-11-21.
K-Lite Codec Pack 8.0.0 - system requirements:
OS: Windows 2000, Windows XP, Windows 7 (32 bit and 64 bit), Windows Vista (32 bit and 64 bit).