How do I fix this problem with my iTunes?

I've been having problems with my iTunes for over a week now - since I tried to update to iOS 5 - and I've tried everything. I've had to uninstall iTunes multiple times and each time I have reinstalled it, there has been some form of error, the list seems endless. Today, I managed to get an older version to succeessfully install but when I tried to update to the newest version, this is what appeared on my screen after the 'install.'
"The procedure entry point AVCFAssetCreateWithByteSystemAndOptions could not be located in the dynamic link library AVFoundationCF.dll"
Any idea what this means, and/or how to resolve it?

Let's try a standalone Apple Mobile Device Support install. It still might not install, but fingers crossed any error messages will give us a better idea of the underlying cause of why it's not installing under normal conditions.
Download and save a copy of the iTunesSetup.exe (or iTunes64setup.exe) installer file to your hard drive:
http://www.apple.com/itunes/download/
Download and install the free trial version of WinRAR:
http://www.rarlab.com/
Right-click the iTunesSetup.exe (or iTunes64setup.exe), and select "Extract to iTunesSetup" (or "Extract to iTunes64Setup"). WinRAR will expand the contents of the file into a folder called "iTunesSetup" (or "iTunes64Setup").
Go into the folder and doubleclick the AppleMobileDeviceSupport.msi (or AppleMobileDeviceSupport64.msi) to do a standalone AMDS install.
(If it offers you the choice to remove or repair, choose "Remove", and if the uninstall goes through successfully, see if you can reinstall by doubleclicking the AppleMobileDeviceSupport.msi again.)
Does it install (or uninstall and then reinstall) properly for you? If so, does your device connect without that message now?

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