No Audio in Quicktime 7.7.4, but Quicktime Trailers play fine.

I have no audio, but picture is fine in Quicktime 7.7.4 on Windows XP.I have tried everything I can think of. Uninstalled every single Apple program and reinstalled, still no audio. Tried earlier versions of Quicktime, still no audio. Uninstalled Itunes and re-installed, still no audio. Audio plays fine in every other program, website, it just doesn't play in any quicktime videos. The video part plays fine, just no sound. I've checked all volume levels and nothing is on mute. I've ran codec programs to check and make sure no codecs are corrupt, still no audio. Any help? I have an AMD Athlon Windows XP with Nvidia audio drivers.

Howdy Brian,
I found the perfect article to help troubleshoot the lack of audio when you play movies in Quicktime. Its named iTunes and QuickTime for Windows: Audio does not play or plays incorrectly and can be found here http://support.apple.com/kb/ts1362.
All the best,
Sterling

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+I have various quicktime files on the pc that played fine but are now unable to be viewed. I have downloaded again, they play fine... but now a few days later... audio, but no video at all... not "scrambled", just video "noise", really.+
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