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Hi, you may need to completely uninstall iTunes and all of it's associated content before re-installing it.
Uninstall iTunes and related software components in the following order:
On some systems, iTunes might install two versions of Apple Application Support. This is expected. If both are present, be sure to uninstall both versions.
Don't uninstall these components in a different order, or only uninstall some of them. Doing so might have unintended effects. After you uninstall a component, you might be prompted to restart your computer. Wait to restart your computer until you're finished removing all of the components.
You can uninstall programs on the Settings page. To repair a program, use Control Panel.
On the Start menu select Settings.
In Settings, select System > Apps & features.
Select the program, and then select Uninstall.
Follow the directions on the screen.
Once you've completed the removal, restart your computer and re-install iTunes again. Make sure you download and install the latest release: