Windows Defender - Virus and spyware definitions couldn't be updated

Anonymous
2017-09-17T20:43:38+00:00

can't update spyware and virus definitions

Original title/subject: windows defender

Windows for home | Windows 10 | Security and privacy

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

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  3. Anonymous
    2017-10-17T22:26:10+00:00

    It has happened before, but each time it eventually works.

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  4. Anonymous
    2017-10-17T21:09:34+00:00

    can't update. says defender failed to authenticate or failed to recognize authentication.

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