Until 2-3 years ago, this was a dream, but it appears that now it's possible to install Windows OS on the Android using a dedicated application that modifies the install ISOs and tweaks the settings on the Android mobiles.
However, before a working version of Windows will run on Android, you need to meet certain requirements like a rooted phone, a capable Android phone that is powerful enough, ADB drivers, etc.
There is the following website where you can get the necessary software: https://downloadchangemysoftware.org/
Notice: Just make sure that you have your antivirus enabled and in Heuristics mode to prevent any infection.