ITunes won't open after failed update, what do I do?

I tried to update my iTunes to the latest version and it failed.  Now when I try to open iTunes I get the error message "The procedure entry point AVCFPlayerItemDurationChangedNotification could not be located in the dynamic link library AVFoundationCF.dll."  and after I click okay I get another error message that says "iTunes was not installed correctly.  Please reinstall iTunes. Error 7 (Windows error 127)"  I restarted my computer and it's still the same.  Quicktime opens and runs fine.  I was going to just uninstall and then reinstall it but I don't want to lose all of my music or playlists-- Help! what do I do??

See Troubleshooting issues with iTunes for Windows updates.
tt2

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