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in MDT i have a line "powershell.exe -Uninstall-WindowsFeature -name "Windows-Defender"

I am using this code in my MDT deployments. Try this: To Disable Windows Defender REG ADD "HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender" /v DisableAntiSpyware /t REG_DWORD /d 1 /f To Enable Windows Defender Reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender" /v DisableAntiSpyware /t REG_DWORD /d 0 /f

Thanks guys, i'll check those out