K-Lite Codec Pack 5.7.0 Update
http://www.codecguide.com/klcp_update.htmChangelog 5.6.1 to 5.7.0 ~ 2010-02-03
* Updated Media Player Classic Home Cinema to version 1.3.1595.0
* Changed default video renderer in MPC-HC on Vista/7 to "EVR Sync"
* Changed default H.264 decoder from "ffdshow (libavcodec)" to "DivX H.264"
* This gives better decoding performance, certainly on computers with multiple CPU cores
* Updated Gabest MP4 splitter to version 1.3.1572.0
* Updated AC3ACM to version 1.5
* Updated Codec Tweak Tool to version 4.2.0
* Updated Win7DSFilterTweaker to version 2.8
* Minor changes
Vista Codec Package 5.5.6
http://www.filehippo.com/download_vista_codec_package/