If Group Policy is not available (Windows 10 Home), the registry might have a disabling key.

Uninstall the third-party antivirus via Settings > Apps > Apps & features . After a restart, Windows Defender will automatically re-activate.

Windows automatically disables Defender when it detects another antivirus (McAfee, Norton, Avast, Kaspersky, Malwarebytes, etc.). This is by design to prevent conflicts.

Follow these steps to check and enable it:

If your Windows 10 64-bit system is not showing Microsoft Defender as active, one of four scenarios is occurring:

Download Windows Defender Windows 10 64-bit !new! «PRO»

If Group Policy is not available (Windows 10 Home), the registry might have a disabling key.

Uninstall the third-party antivirus via Settings > Apps > Apps & features . After a restart, Windows Defender will automatically re-activate. download windows defender windows 10 64-bit

Windows automatically disables Defender when it detects another antivirus (McAfee, Norton, Avast, Kaspersky, Malwarebytes, etc.). This is by design to prevent conflicts. If Group Policy is not available (Windows 10

Follow these steps to check and enable it: one of four scenarios is occurring:

If your Windows 10 64-bit system is not showing Microsoft Defender as active, one of four scenarios is occurring:

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