Thank you for posting your concern here at the Microsoft Community forum. Let me assist you with your concern.
This problem may occur after Windows Defender is updated, To resolve this problem, follow these steps:
Set the Windows Defender service to Automatic instead of
Disabled or Manual. To do this, follow these steps:
Click Start, type services in the Start Search box, and then click
Services in the Programs list. If you are prompted for an administrator password or for confirmation, type your password, or click Continue.
Double-click the Windows Defender service, and then in the Startup type box, click
Hope this helps. If you need further assistance with Windows, let us know and will be glad to help.
John Rubdy Forum Moderator | Microsoft Community
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