Windows Defender - Turn On or Off is two registry files you simply double-click to turn Windows Defender on or off.This is a zip file containing two files:Turn_Off_Windows_Defender.reg and Turn_On_Windows_Defender.reg.Simply double-click whichever you need, click yes and reboot.While it might also work in Windows 8.1, we only tested it under 10 and don't recommend it.Remove Windows Defender from Windows 10 and Windows 8.1 shows you the two ways you can disable Windows 10 if you want to do manually.