QT 7.5, . 1st No Sound, then forum help, sound again & no sound again

Hi,
I updated the QT to 7.5. Obviously, had lost sound on AVI, MPG Files. Then i followed it up in this forum and did all the steps to get the sound back.
Now yesterday when I play my MPG, again no sound, only picture.
My Mac is currently not connected on the internet, hence nothing is changed or upgraded. No software's installed or removed.
What could I do to get the sound back?
Thanks,

"Then i followed it up in this forum and did all the steps to get the sound back."
Which steps? Need this info to avoid the +"been there, done that"+ scenarios. This will avoid the knowledgeable users suggesting duplicate troubleshooting solutions/suggestions that you may have already tried.
Have you tried any of the following?
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.

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