The Your Windows hasbeen banned or Your Windows Has Been Banned screen locker is a Trojan that displays a fake security screen stating that the PC has been banned due to unusual activity being detected. It then tells you to contact the nearest Microsoft technician to get a an unlock code to unlock it. Once you enter the correct code, the screen will unlock and another screen will be displayed that contains instructions on how to remove the Trojan. The unlock code for this scam could be retrieved from the executable and can be entered into the field to terminate the screen locker.
Source: https://www.bleepingcomputer.com/virus-removal/remove-your-windows-hasbeen-banned-screenlocker