The program can't start because AVFoundationCF.dll is missing from you computer.

I have tried to install new version of itunes but failed many times. please help!!

Hey jeffjo64,
I would run through the recommended troubleshooting steps in here:
Issues installing iTunes or QuickTime for Windows
http://support.apple.com/kb/HT1926
Welcome to Apple Support Communities!
Sincerely,
Delgadoh

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