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Errors can be caused by any number of things...

*Make sure that the Windows Defender service is set to Automatic and is started.

*If you have recently installed new updates via Windows Updates, you may try and revert them one by one unti you can find the source of your problem.

*If all else fails, uninstall Windows Defender and reinstall with the latest version.

*If you receive a specific error code, look it up in Microsoft's KnowledgeBase.

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13y ago

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