I just installed quicktime 7.7.2 to watch movie trailers, works but no sound

I just installed quicktime 7.7.2 to watch movie trailers on http://trailers.apple.com/trailers. It plays the trailers OK but there's no sound. Any ideas? I have Windows XP.
Quicktime installation also changed the association on an m4v movie that played perfectly with the VLC movie player, but plays real jerky with the QT player and also there's no sound. Any ideas?
Thnx

I just installed OuickTime 7 Pro in my Mac Pro Ver 10.6.8. The video I am trying to view is codec h264 Compression dvcpro 50 hd. I have audio but no video. It says I need other software with QuickTime for it to work. Dose anyone know what I need?
H.264 video should be supported by your basic Snow Leopard operating system. The DVCPRO HD family of codecs is part of the Apple "Pro" codecs package which is normally installed as part of a "Pro" video editing suite installer or contemporaneously installed separately as part of one of the newer pro editing apps like FCPX. if you already have one of these pro suites or apps installed or available, then re-install the correct codec package that is missing. If not, you will need to purchase a Pro suite or app to be able to install the required codec package.

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tt2

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Found 0 results for My browser is missing important items, the whole tool bar...., drop down menu to print, copy, work off line, file, save, book mark, history. I just installed latest foxfire on windows xp. Found some instructions but they called for usi

Found 0 results for My browser is missing important items, the whole tool bar...., drop down menu to print, copy, work off line, file, save, book mark, history. I just installed latest foxfire on windows xp. Found some instructions but they called for using keys my computer doesn't have ( key in OSX There is no file, edit , history, help, tools, navigation, all the things your directions say to use. Also I always get hung up and the message a scrip is running. I don't know what thises scrips are but I sure don't need them.
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Every time Firefox opened
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Sorry to post in the wrong place.
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I just installed quicktime 7.7.2 to watch movie trailers, works but no sound

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