Video O.K but no audio when QuickTime's launched.

I'm not getting audio when QuickTime is launched. Can't hear movie trailers or any type of audio being streamed using QT. I'm also having issues with iTunes. Here's a my short entry that I posted in the iTunes section:
"Only when listening to iTunes do I experience choppy audio; Whether its podcasting, songs chosen from my Library or radio streaming. I've uninstalled, then re-installed iTunes but to no avail."

I recently started having audio problems (namely: no audio, but video is fine) when I upgraded to the latest QuickTime version.
In fact, since I had problems on my computer I watched some trailers on my Dad's computer and it worked fine with the older version of QT. But then recently I agreed to upgrade his iTunes and QuickTime and since then I can't watch the same trailers...
Whoopsie.
Oh, and I'm not having any choppy audio with my iTunes. That sounds like too many programs running at once or something.
--cbelz

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Video O.K but no audio when QuickTime's launched.

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