Windows Essentials Codec Pack is a collection of video and audio codecs and tools that are required to encode and decode (that is, play) audio and video files. With this pack, according to the developer, you should be able to play 99% of all the movies and music files that you download off the Internet, and stay up to date with the latest codecs through the program's Codec Update Service.

Windows Essentials Codec Pack is free and user-friendly, as you get all the work done with just a couple of clicks. Also, it keeps your computer up to date with the latest codecs and it's 100% spamware / adware / spyware / free.

But more importantly, unlike other codec packs which include several filters and decoders that are capable of decoding the same media format (which usually cause many conflicts and errors) Windows Essentials Codec Pack was especially designed to assign each file type to the most appropriate filter or decoder, which not only reduces the installer size but also eliminates many of the conflicts and errors caused by multiple codecs being used to decode the same file type.