QT wont play certain files all of a sudden

I updated my QT 7.2.0 to 7.2.2 and QT wont play my mp4 files, I get an error saying ' movie could not be opened an invalid sample description was found in the movie' . Also it wont play the audio on some formats and I can't get ant audio from youtube. I have flip 4 mac. real audio. m player and divx installed, and I also downloaded some codec as directed by apple when it wouldn't play a certain file. can I go back to my original qt as it was working great. I previously bought QT pro but also had it when I bought 4.5 hd and have just upgraded to FCS 2 can I just reinstall qt from my FCS 2 dvd. And how or should I delete the codecs maybe they are messing QT up.

Thanks, by that I prosume you mean all divx codecs. But does that include x in the extention name ie npUpload.xpt . Also when I go to you tube for example the film plays but no sound. I downloaded vlc which will play my .mp4 files but with no sound. I Work on Logic Studio so I use a motu 896 converter but it does'nt seem to be that. Can I just reinstall QT 7.2 from FCS2 as that was working perfect. Once again Thanks

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