How to do if fails to repair iTunes?

Step1: Go to the Control Panel ->Program->Programs and Features

In windows 10, click or tap inside the search box on the taskbar, then type “Control Panel”, click it in the search result and open the Control Panel

Step2: Find the iTunes components marked on the following screenshot.

Step3: Download the latest iTunes from the official website and reinstall it.

But if you cannot download iTunes from the link above, try to download the installation package by the following link:

Windows 64-bitowy: https://www.apple.com/itunes/download/win64

Windows 32-bitowy: https://www.apple.com/itunes/download/win32

Step4: After install iTunes completed, restart computer and try again.