ITunes Apple Application Support error on Windows 7 Professional PC HRESULT: 0x80070091

Hello,
ITunes suddenly stopped working on my Windows 7 Professional PC.
I was initially getting an Error 2 -- and I followed the instructions to uninstall and reinstall iTunes (restarted, updated Windows and ran CCleaner inbetween).
After the new install, I received the error:
Apple Application Support was not found.
I downloaded WinRAR and tried to install a standalone version of Apple Application Support. I still cannot start iTunes, and receive the following error message.
Error message:
An error occurred during the installation of assembly 'Microsoft.VC80.CRT, type="win32",version='8.0.50727.6195",publicKeyToken="1fc8b3b9a1e8e3b',processo rArchitecture='amd64'. Please refer to Help and Support for more information. HRESULT: 0x80070091.
I have a new laptop with Windows 8.1, and I want to transfer my libraries to it anyways. So, I'd like to either get iTunes functional on the Windows 7 PC, or find out if there is a way to simply move the libraries for ipod and ipad to the laptop without iTunes active on the PC.
Thanks so much for your help.

For general advice see Troubleshooting issues with iTunes for Windows updates.
The steps in the second box are a guide to removing everything related to iTunes and then rebuilding it which is often a good starting point unless the symptoms indicate a more specific approach. Review the other boxes and the list of support documents further down page in case one of them applies.
Your library should be unaffected by these steps but there is backup and recovery advice elsewhere in the user tip.
The section Install missing components has advice on breaking down the iTunes installer into the individual .msi files which might prove useful if Apple Application Support won't install normally.
tt2

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