Windows Defender is already installed on your Windows 10 and it’s making your pc slow. so let’s see how to get rid of it. Turn Off Windows Defender Antivirus in Windows 10 can be tricky. I’m gonna show you 3 ways to temporary or permanently turn off or disable Windows Defender in Windows 10 and then how to turn it back on incase you changed your mind. Windows Defender is the default security software program that comes with every Windows 10 installation. It does a pretty good job of making sure that your PC is safe. But still for some reasons you might wanna disable it.