Lost all sound on upgrade to 7.0.3 from 6.5.2

Hi,
I am a total computer idiot and I need help. I've upgraded from QT 6.5.2 to 7.0.3; after I did that I lost (almost) all sound when playing QT movies. Files saved to my hard-drive that used to play with sound no longer do so. And QT files found online (through apple trailers, for example) no longer play with sound.
I say "almost" as there are a few files on my hard drive which still have sound. There's nothing special about these files which I can see though. One of them is an .mov, but all the rest of my .mov files don't have sound. The other is a .mpg, but all the rest of my .mpg files don't have sound.
After some reading about in this forum I found some genral comments about ones midi settings. Checked those against what are supposed to be the correct values, and they seem fine.
So anyone have any idea about what might be up? Seriously, suggest anything, even the most obvious stuff.
thanks
PowerBook G4 1.25GHz Mac OS X (10.3.9)

I have the same problem but with the QT 7.0.4...
Try to reinstall QT 6.5.2 (in 2 steps)
1) reinstall 7.0.1
http://www.apple.com/support/downloads/quicktime701reinstallerforquicktime703.ht ml
In my case 7.0.1 doesn't work too... may be an additional coded ?? but i have no time to analyse.
2) reinstall 6.5.2
http://www.apple.com/support/downloads/quicktime652reinstallerforquicktime701.ht ml
Good luck
iMac G51.8 GHz 1GO DDR SDRAM Mac OS X (10.3.9)

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Lost all sound on upgrade to 7.0.3 from 6.5.2

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