The video and audio are out of sync while watching movies with iTunes

Anyone know why iTunes is playing movies out of sync?  I try to watch a movie on my pc with iTunes but the audio is faster then the video. 
I have searched for an answer everywhere but haven't found one yet, so if someone could please help.
It is updated as of this post with 10.6.1.7

Repair your QuickTime.
Control Panel > Programs n Features > highlight QuickTime, click CHANGE then REPAIR

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