Windows Essentials Codec Pack

Windows Essentials Codec Pack screenshots

It's easy to use and even easier to install/uninstall
update service
Windows Essentials Codec Pack 1.0 : update service

Alternative downloads

K-Lite Codec Pack
Plays all the popular audio and video formats and several less common formats.
14.1.0
FREE
K-Lite Mega Codec Pack
Install audio and video codecs for playback, editing, and encoding.
14.1.0
FREE
Windows 7 Codec Pack
Play all video and audio formats.
4.1.6
FREE
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