Archive · 30 Aug 2026
Microsoft Says False Defender Shutdown Alerts Are Windows Glitch
Some Windows computers are showing a warning that virus protection is turned off.
Microsoft says the warning is a mistake caused by a software glitch.
Microsoft Defender Antivirus is still working correctly.
The warning may appear when the computer starts or while someone is using it.
It can continue appearing even if notifications are turned off.
The problem is linked to recent antivirus updates.
Microsoft is working on a fix.
Until then, users can check Windows Security for any real warnings and ignore the false pop-ups if no genuine alert appears.
Microsoft confirmed that pop-ups claiming Microsoft Defender Antivirus is turned off are incorrect.
The alerts can appear when Windows starts and intermittently during use, even with notifications disabled.
Microsoft said the issue was triggered by the latest Defender Antivirus updates.
The antivirus is functioning correctly and its settings continue to show it as active.
The glitch can affect Windows and Windows Server devices running the latest Defender updates, and Microsoft is developing a fix.
- Who
- Microsoft and users of Windows devices running Microsoft Defender Antivirus.
- What
- A glitch is causing false Windows Security warnings that Microsoft Defender Antivirus is turned off.
- When
- The warnings began appearing after the latest Defender Antivirus updates; Microsoft recently confirmed the issue and said a fix is in development.
- Where
- On devices running Windows or Windows Server with Microsoft Defender Antivirus.
- Why
- The Windows Security app is randomly generating incorrect “Turn on virus protection” notifications after recent Defender updates.
- Affected product
- Microsoft Defender Antivirus
- Warning shown
- “Microsoft Defender Antivirus is being turned off” or “Turn on virus protection”
- Actual status
- Microsoft says the antivirus is functioning correctly and settings show it as active.
- Trigger
- The latest Microsoft Defender Antivirus updates
- Timing
- Alerts may appear at startup and intermittently during normal use.
- Notification settings
- The alerts may persist even when notification settings are disabled.
- Microsoft response
- Microsoft is working on a resolution.