WINDOWS UPDATE NOT INSTALLING

Adrian Grice 0 Reputation points
2026-08-16T08:53:50.5866667+00:00

2026-08 SECURITY UPDATE (KB5121003) (26200.9168) KEEPS SAYIN SOMETHING DIDN'T GO HAS PLANNED DON'T WORRY UNDOING CHANGES. IT DOES THIS A FEW TIMES BEFORE MY PC STARTS UP.

Windows for home | Windows 11 | Windows update
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  1. DaveM121 919.8K Reputation points Independent Advisor
    2026-08-16T09:26:30.02+00:00

    Open the Settings App.

    Go to System - Recovery.

    Click the 'Reinstall Now' button in the 'Fix problems with Windows Updates', section, then wait for that process to complete, that process should resolve any errors in Windows updates.

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  2. Thoura Sopheak Nanta 655 Reputation points
    2026-08-16T09:11:49.39+00:00

    Hi @Adrian Grice

    Press Win + I, then go to System > Troubleshoot > Other troubleshooters > Run Windows Update troubleshooter.

    If it fails, try running this in Command prompt as administrator and run these separately:

    sfc /scannow
DISM /Online /Cleanup-Image /RestoreHealth

    This repairs corrupted system files, as this may cause error in updating.

    Also, in Windows Security, did it mention anything about Secure Boot certificates?

    If it does, update your BIOS/UEFI To the latest version so your BIOS/UEFI Supports the new certificates.

    Hope this helps! I'm hoping to hear back from you!

    Best regards,

    Nanta

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