To manually disable Windows Defender on Windows 8 computer, you can choose one from the three methods introduced in this article.
Video guide on how to disable Windows Defender on Windows 8:
Way 1: Disable Windows Defender in the app's Settings.
Step 1: Start Windows Defender.
Step 2: Enter Settings, choose Administrator on the left, uncheck the small box before Turn on Windows Defender on the right and click Save changes on the bottom.
Way 2: Disable the app in Group Policy.
Step 1: Open Group Policy Editor.
Step 2: Find and open Windows Defender folder which is located in Computer Configuration/Administrative Templates/Windows Components.
Step 3: Access the setting called Turn off Windows Defender in Windows Defender folder.
Step 4: Choose Enabled and tap OK to enable the setting.
Way 3: Disable the Windows Defender in Services.
Step 1: Press Windows key+F to open Run dialog, enter services.msc and click OK to enter Services.
Step 2: Right-click Windows Defender Service in the Services window, and select Properties in the context menu.
Step 3: As the Windows Defender Service Properties (Local Computer) dialog appears, in General settings, click the small down arrow and choose Disabled as the startup type. Then, tap OK to finish the setting.
Step 4: Restart your computer to make the setting effective.
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