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Windows 11's Defender kept falsely saying your antivirus was off, and Microsoft just fixed it
Tech Optimizer
September 19, 2026

Windows 11’s Defender kept falsely saying your antivirus was off, and Microsoft just fixed it

For nearly two months, Windows 11 users received persistent notifications from the Windows Security app falsely indicating that Microsoft Defender was disabled, despite it functioning properly. This issue, which began in early August, has been addressed with a security update from Microsoft. The false alerts affected all versions of Windows 11, Windows Server, and Windows 10, and were linked to a bug introduced with a recent Defender security update. Microsoft confirmed that no manual action is required from users to resolve the issue, as the fix will be automatically deployed to all PCs with mandatory security updates enabled. The problem was resolved in the Microsoft Defender Antivirus update (version 4.18.26080.4), released on September 17, 2026. Users can verify the status of Defender by checking Windows Security or using a PowerShell command.
Microsoft explains why restarting Windows can shut it down more completely than actually shutting it down
Winsage
September 18, 2026

Microsoft explains why restarting Windows can shut it down more completely than actually shutting it down

The Fast Startup feature in Windows, enabled by default, allows the kernel session to remain hibernated during shutdown, which results in quicker boot times by restoring a saved state. In contrast, selecting Restart clears the kernel session entirely, performing a complete boot of Windows. The process of shutting down with Fast Startup involves closing applications, logging off, keeping the kernel loaded in memory, saving the kernel and drivers to hiberfil.sys, and powering off, while Restart closes applications, logs off, ends the kernel session, and reboots immediately without saving a kernel snapshot. Fast Startup can lead to persistent issues from previous sessions, making Restart a better option for troubleshooting. To perform a full shutdown bypassing Fast Startup, users can execute the command "shutdown /s /t 0." Microsoft advises against permanently disabling Fast Startup, as it enhances shutdown-to-boot transitions.
Microsoft fixes Teams, Outlook launch failures on ARM Windows PCs
Winsage
September 11, 2026

Microsoft fixes Teams, Outlook launch failures on ARM Windows PCs

Microsoft addressed a significant bug that affected the launch of Teams and Outlook on ARM-based Windows devices after updates from the August 2026 Patch Tuesday. The issue primarily impacted users of devices like the Surface Pro 11 and Surface Laptop 7 running Windows 11 24H2 or later, who had not installed necessary updates from the Microsoft Store. The bug caused Teams and Outlook to fail to launch or close unexpectedly following the installation of security updates released on or after August 11, 2026 (KB5121003). Classic versions of Outlook and other applications were not affected. A temporary workaround was suggested, involving updating the Auto Super Resolution Package. The bug was resolved through cumulative updates released on September 8, 2026 (KB5124012), and users were urged to install the latest updates for improvements and issue resolutions. Additionally, Microsoft acknowledged other issues related to updates from August, including disruptions in printing and PDF exporting due to .NET Framework updates, gaming problems from peripherals with RGB lighting, and alerts regarding Microsoft Defender Antivirus being disabled. They also fixed issues related to the loss of custom mouse settings and desktop configurations following the installation of the KB5120998 August 2026 preview update.
Microsoft says September updates fix mouse settings reset issues
Winsage
September 10, 2026

Microsoft says September updates fix mouse settings reset issues

Microsoft acknowledged an issue with the KB5120998 August 2026 preview update for Windows 11, where mouse settings related to cursor personalization were altered or reset. This problem affected non-English Windows installations, causing personalized settings to fail to load and revert to standard configurations. The issue was resolved in the subsequent KB5124008 September 2026 cumulative update, which users were encouraged to install. KB5120998 was an optional update, potentially limiting the number of affected users. Additionally, Microsoft has been addressing various mouse-related issues in recent months, including problems with the Windows Recovery Environment and disappearing mouse pointers in Outlook.
Microsoft fixes bug that wiped Windows desktop settings
Winsage
September 10, 2026

Microsoft fixes bug that wiped Windows desktop settings

Microsoft announced that the September 2026 Patch Tuesday updates resolved an issue affecting desktop settings on certain Windows devices, which caused desktop wallpapers to revert to a solid black background after the installation of the KB5120998 August 2026 preview update. This bug impacted Windows 11 24H2 and 25H2 systems, preventing the correct loading of desktop settings and also affecting mouse settings. Microsoft recommended users update their devices to the latest security update released on September 8, 2026 (KB5124008) to benefit from the fix.
Windows 11's last Secure Boot deadline is weeks away, here's what you must do
Winsage
September 10, 2026

Windows 11’s last Secure Boot deadline is weeks away, here’s what you must do

Microsoft is continuing the rollout of Secure Boot certificate updates, with the next significant deadline on October 19, 2026, when the Microsoft Windows Production PCA 2011 certificate expires. The September 2026 Patch Tuesday update has expanded eligibility for Secure Boot certificates to more PCs classified as “high confidence.” Users may need to reboot their PCs to install these updates, and some may require firmware updates beforehand. Microsoft has confirmed that the update process will persist beyond established deadlines, and older certificates are expiring in stages, with the first two deadlines having already passed. Users should ensure they have the latest updates installed and check their Secure Boot status in Windows Security. Microsoft has assured that PCs without the newer certificates will continue to boot normally and receive standard updates while the rollout continues.
Microsoft releases Windows security update addressing 723 flaws
Winsage
September 8, 2026

Microsoft releases Windows security update addressing 723 flaws

Microsoft released its September 2026 security updates, addressing two critical Windows elevation-of-privilege vulnerabilities: CVE-2026-85880 and CVE-2026-81963. Both vulnerabilities were exploited before their public disclosure on September 8. CVE-2026-85880 involves a heap-based buffer overflow in the Windows Advanced Local Procedure Call (ALPC), allowing low-privileged attackers to gain SYSTEM privileges. CVE-2026-81963 affects the Windows Update Stack due to improper link resolution and access controls, enabling similar privilege escalation. The September release also includes 974 Common Vulnerabilities and Exposures (CVEs) across various Microsoft products, with 723 affecting Windows. Users of Windows 11 24H2 and 25H2 receive updates via KB5124008, while Windows 11 26H1 receives KB5124012. Windows 11 24H2 Home or Pro editions will reach end of servicing on October 13, 2026. Users are advised to install the updates promptly and back up important data.
4 ways to get Windows 11’s newest features sooner
Winsage
September 8, 2026

4 ways to get Windows 11’s newest features sooner

Several pathways exist to expedite the official rollout of Windows updates. Users can navigate to Windows Update settings to enable the latest updates, install optional preview updates manually, join the Windows Insider Program for pre-release versions, or use ViveTool to unlock hidden features. 1. Enable the latest updates: A toggle in Windows Update settings allows users to receive new features and updates as soon as they are available. 2. Install optional updates: Preview updates are released towards the end of each month and can be installed manually through Windows Update. 3. Use Windows Insider: The Insider Program offers pre-release versions of Windows, with the Beta Channel for innovation and the Release Preview Channel for stability. 4. Enable hidden features with ViveTool: This tool unlocks features already present in Windows but not activated, requiring technical expertise. Activating the toggle in Windows Update prioritizes the device for new features while ensuring essential security updates continue.
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