![Image](https://3.bp.blogspot.com/-BbPI8-o2wjc/WFMqmWfkAdI/AAAAAAAABoE/eE5UeBUpUdwPcXx2VtBFwl4fimA_2nboQCLcB/s1600/defender_control.png)
In previous Windows version, turning off or disabling Windows Defender was easy. There was an option under Windows Defender Settings to turn on or off the defender. In Windows 10, Microsoft has moved Windows Defender settings to the Settings app , While there is an option to turn off real-time protection of Windows Defender, there is no option to completely turn off Windows Defender
here is a tiny tool designed to enable you completely turn off or disable Windows Defender in Windows 10
http://www.sordum.org/9480/defender-control-v1-2/