Issue with updating Windows Defender definitions

Williams 175 Reputation points
2023-12-03T16:47:53.5466667+00:00

I manually checked for updates in Windows Defender, but it said no new updates were available. However, I found new updates on the website and downloaded them manually. Even though the setting is set up to check for updated definitions before scanning, it did not work. How can I fix this issue?

Windows 11
Windows 11
A Microsoft operating system designed for productivity, creativity, and ease of use.
8,974 questions
Microsoft Configuration Manager Updates
Microsoft Configuration Manager Updates
Microsoft Configuration Manager: An integrated solution for for managing large groups of personal computers and servers.Updates: Broadly released fixes addressing specific issue(s) or related bug(s). Updates may also include new or modified features (i.e. changing default behavior).
1,011 questions
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Accepted answer
  1. Simon Ren-MSFT 32,146 Reputation points Microsoft Vendor
    2023-12-06T09:16:05.44+00:00

    Hi,

    Thank you for posting in Microsoft Q&A forum.

    1,Make sure you downloaded the correct version for your operating system (32-bit or 64-bit). Ensure that the updates you downloaded are compatible with your version of Windows Defender.

    2,Please also make sure that the status of "Windows Defender Antivirus Service" in services.msc is set to "Running" and its startup type is set to "Automatic."

    3,Please check the event viewer to see if there is any related error.

    Thanks for your time. Have a nice day!

    Best regards,

    Simon


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  1. Simon Ren-MSFT 32,146 Reputation points Microsoft Vendor
    2023-12-11T07:58:08.7366667+00:00

    Hi,

    Just checking in to see if there is any update. We haven't heard from you for a few days and would like to know the current status of the problem. Is the problem solved? Do you need any further assistance? Look forward to hearing from you.

    Thanks for your time.

    Best regards,

    Simon

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