Suddenly no audio with mpg files via QT 7.4.5 & no audio with wmv files

Out of the blue, audio playback does not work with any mpg file saved to my hard drive using Quicktime. So, I downloaded the most recent update (7.4.5) and the same thing, no audio. It occurred at the same time when wmv files stopped producing audio on my wmv player. Not sure where the problem exists. I get audio if I open the same mpg using my VLC player...just not QT.
Thanks!!!

See: http://docs.info.apple.com/article.html?artnum=300832 Mac OS X: No audio from certain multimedia content
Trick/Tip: Open up GarageBand if installed then, open a program (optional).
Quit out of the GarageBand app.

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