It really problem and direct prohibition does not help here. You can to disable it, turn off and also disable this service at all, but every time You start Windows You'll get the notification, that Windows Defender is turned off and can't protect Your system.
If you want to install another anti-virus program, I recommend you do so:
Open your Windows Defender, then open the "Settings" and uncheck box before "Turn on Real-Time Protection ..." and then "Save changes" . Then go to the "Administrator" and remove the label before "Turn on Windows Defender" and again the "Save changes".
Now close Windows Defender completely. Suggested: open the "Task Manager" =>
If you want to install another anti-virus program, I recommend you do so:
Open your Windows Defender, then open the "Settings" and uncheck box before "Turn on Real-Time Protection ..." and then "Save changes" . Then go to the "Administrator" and remove the label before "Turn on Windows Defender" and again the "Save changes".
Now close Windows Defender completely. Suggested: open the "Task Manager" =>