defender silent switch is mpas-feX64.exe -q or /q works also You could run the command line version for that "%ProgramFiles%\Windows Defender\MpCmdRun.exe" -SignatureUpdate Either way you have to have Admin rights on that one. Perhaps setupcomplete.cmd? in setupcomplete.cmd we cant hear the mp3 (I'd like to use ur sevenua and playing some mp3 files while installing ), by the way, I've test that again, even in setupcomplete still the same, the security file warning appear (something related with signature verification, I dont know if it becuz some update package I've been integrated/installing in the windows image, but I use only critical update (which appear in windows update but I download the msu n integrated manually) ) I'll report again with a test in vmware later (currently I'm working by now)... Out Of Topic : I need to thx for ur jump2reg application, I fix some of my friend lappy which caused by usb autorun virus (6 fixed manually, 2 needs to reinstall )