AVI=no Audio QT, BUT audio in QUICK LOOK - Perian INSTALLED!

New to avi movies.
Installed PERIAN after having no sound, still no sound in QT. (7.4.1)
Updated to latest QT= still no audio.
If I use QUICK LOOK, sound is fine. Sort of weird, quick look is like the PC in that it plays and opens anything whereas some apple apps by themselves do not.
Advice appreciated. Leopard 10.5.2
Frustrating when QT says its missing a component only to go to a website where it doesn't say "which" plug in is missing - I could promise that there was a day (way back when), when the mac would tell you what was missing.
Advice please.
Thank you.

*A few suggestions:*
Repair permissions & restart.
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.
Install VLC Media Player.

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