Update failed and now system won't work. Itunes update. Running Windows 7-64 Apple Mobile Device failed to start. Asks if I have priviledges

System was running fine until the update

Hello jackhennessy,
Thank you for the details of the issue you are experiencing with installing the latest iTunes update.  I recommend following the steps below as an administrator:
Resolution
Follow these steps to resolve the issue:
Check for .dll files
Go to C:\Program Files (x86)\iTunes and C:\Program Files\iTunes and look for .dll files.
If you find QTMovie.DLL, or any other .dll files, move them to the desktop.
Reboot your computer.
Note: Depending on your operating system, you may only have one of the listed paths.
Uninstall and reinstall iTunes
Uninstall iTunes and all of its related components.
Reboot your computer. If you can't uninstall a piece of Apple software, try using the Microsoft Program Install and Uninstall Utility.
Re-download and reinstall iTunes 11.1.4.
When you get to the step to uninstall iTunes, it is important to uninstall iTunes and the related components in the order listed in the link for that step.  You can find the full article here:
iTunes 11.1.4 for Windows: Unable to install or open
http://support.apple.com/kb/TS5376
I recommend the following article if you continue to receive an error:
How to restart the Apple Mobile Device Service (AMDS) on Windows
http://support.apple.com/kb/TS1567
Thank you for using Apple Support Communities.
Best,
Sheila M.

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