Hello, I've HP dv6226tx and using windows vista home premium [updated to sp2] i was using klite codec pack mega earlier. i had some problem with selecting one audio in dual audio files, so i wanted to try cccp and shark's codec packs. i uninstalled klite codec pack and installed cccp. then if i play movies in windows media center[WMC], it has shacy playback frequently and sometimes fastfrward and freezes sometimes. so i think, may be problem with cccp, so tried to install shark after uninstalling cccp as i had used them earlier in old pc.. but problem persists. so i thought, may be klite was perfact ,so rolled back to klite, but still problem persists. in all these codecs, movie is playing fine in mediaplayerclassic and WMP, but problem with media center playback. ================================== Some info if any relation with problem: in last week, i had updated my vista from home premium to sp1 and from sp1 to sp2..just added info if it has any relation.. when i uninstalled klite first time, it was showing xvidcore.ddl missing and when i installed it last time, it showed same message and asked to disable it. ======================= i've googled "repair media center and found microsoft blog . http://blogs.msdn.com/astebner/arch...es-and-registry-entries-on-windows-vista.aspx Uploaded log file from that scan.. http://www.mediafire.com/file/mmmi3jmmkt3/CBS.zip it may help us to reach diagnosis. ======================= Thanks.