How to Disable Windows Defender Completely

Warning: Only do this if you understand the risks.

Step 1: Enter the Windows Recovery Environment

Press and hold Shift while pressing Power → Restart

Alternatively, use any other method from this article.

Step 2: Open Recovery Command Prompt

Use Advanced options → Command Prompt

Step 3: Move Defender Engine to a Different Path

cd /D "C:\ProgramData\Microsoft\Windows Defender"
move Platform Platform_disabled

How to Re-enable

Repeat steps 1-2, then move the Defender Platform directory back:

cd /D "C:\ProgramData\Microsoft\Windows Defender"
move Platform_disabled Platform