Q: Itunes not installing on windows 10.

Did you generate a log file?

tt2

See this post for steps to produce detailed logs of the installation.

tt2

I had the same problem and found a solution that you probably already have tried; un-install all software authored by Apple Inc then do a refresh install of itunes. The key is uninstalling "all"  apple software. Go to the Settings/Systems/ apps literally start going down the list of installed apps. I found a bunch of Apple related apps still installed on my computer. I potentially found the one that caused the "Windows Installer" error when you try and install itunes. As such, I had to repair that app first before I could uninstall it which you can do if you click on the Modify option. It was the Bonjour app. After I uninstalled that app, I tried to re-install iTunes again and it ran smooth. It may be worth mentioning that I also tried installing the visual C++ files as well before I manually looked for and uninstall those apps. Hopes this helps

doesn't work and same error comes up, the solution on several times is win 10 screws up protected files

run cmd as administrator and run sfc /scannow

The solution for Windows 10 is on my tread

iTunes for Windows 10 Solution