Audio Sync issues - PLEASE help

I have created many videos in iMovie '09.    I have used the HD setting for them, 1280x720 even though they were shot in SD format.  I have uploaded them to YouTube and they all view just fine.  They all viewed just fine in Quicktime version 7.6.6, as well.
I have been doing this for years now, since at least 2009, and all video/audio has worked flawlessly together.
My most recent problem (past few months) has been that I am now running Mac OS X version 10.6.8.    My iTunes is 10.4  and my Quicktime is now 10.0
And now my audio and video WILL NOT SYNC. 
I need help very badly because I have a presentation on Saturday and I need to load a bunch of videos (in the same viewer window) and have those videos play in a loop, one right after the other, while I'm talking to prospective clients.
I put these same movies into Quicktime Player 7 version 7.6.6  and they play just fine, still -  I just tested this on my imac and my macbook. 
I need these videos to play in my iTunes, but the audio/video sync issues have ruined my video play. 
Can someone PLEASE help me remedy this situation.  I would be forever grateful. I have casually searched for an answer, repeatedly but I need to remedy this by Friday night.
Thank you so much,
YahYah

What format are you using in iTunes to play them back?  Are these the exact same files as the one, you are playing back in Quicktime 7?

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