I can't open iTunes on my computer.

When I tried to turn on iTunes yesterday I got the error message, "The procedure entry point AVCFPlayerItemDurationChangedNotification could not be located in the dynamic link library AVFoundation CF.dll."  Then, when I clicked OK, I got a message saying iTunes was improperly downloaded and I need to download it again.  How have I been using it for three years if it was improperly downloaded?  I don't want to lose my library.  I have much of it saved on CD's but lately I've been backing up to a flash drive and someone told me today that won't reload to iTunes.  What do I do?

Try removing iTunes, Apple Application Support, and the related Apple software using Control Panel. For a walkthough on the process, check out this Apple document -> Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7
Then try downloading and reinstalling the latest version of iTunes from here -> Apple - iTunes - Download iTunes Now

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