notifications about Defender on start up

Danny L Dortch 20 Reputation points
2026-09-08T13:55:47.2133333+00:00

i keep getting a notification to turn on my Defender when after i sign in with my pin but its already turned is something trying to attack or hack my pc?

Windows for home | Windows 11 | Security and privacy
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AI answer

2026-09-08T13:56:04.4+00:00

If Windows Security shows Microsoft Defender is active, this notification does not by itself mean the PC is being attacked or hacked.

Microsoft has a confirmed issue where notifications can incorrectly say "Microsoft Defender Antivirus is turned off" even though Defender is functioning correctly and settings show it as active. These notifications can appear at startup and intermittently afterward, and can persist even if notification settings are turned off.

What to check:

  1. Open Windows Security and confirm Defender is shown as active.
  2. Check the notification area icon status:
    • Green = protected
    • Yellow = potentially unprotected
    • Red = at risk
  3. Open Protection history in the Windows Security app and review whether there are actual alerts such as:
    • Threat blocked
    • Remediation incomplete
    • An important service is off

If Windows Security still shows Defender is on and there are no real threat alerts in Protection history, this points to the known false notification issue rather than an active attack.

Microsoft is working on a fix in a future Microsoft Defender Antivirus update. If the pop-up keeps happening, report it through Feedback Hub using Win+F.

References:

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  1. Antonio Macedo 0 Reputation points
    2026-09-10T10:56:56.2966667+00:00

    This warning started showing after installing "Extended Security Updates (ESU) KB5126256.
    I've uninstalled this update, but the warning still keeps showing at startup.

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  2. CrazyKats 19,245 Reputation points Volunteer Moderator
    2026-09-08T15:20:43.91+00:00

    Hi Danny,

    This is a Known Issue, it is really On

    even though the notification is saying

    it's Off.

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  3. Danny L Dortch 20 Reputation points
    2026-09-08T14:00:02.62+00:00

    checked all Defender actions and all are green no action needed

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