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2026-03 Security Update (KB5078740) (26100.32522)

John Mays 0 Reputation points
2026-04-07T15:00:02.14+00:00

2026-03 Security Update (KB5078740) (26100.32522)

error Install error - 0x80070306

cant find a solution

Windows for business | Windows Client for IT Pros | Devices and deployment | Install Windows updates, features, or roles
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  1. Scott Nguyen 690 Reputation points Independent Advisor
    2026-04-07T19:25:50.7233333+00:00

    Hello.

    That 0x80070306 error usually indicates a revision mismatch within your Windows Component Store, which means it is seeing a version conflict that cannot resolved during the update.

    You should run an elevated Command Prompt and execute dism.exe /online /cleanup-image /restorehealth followed by sfc /scannow to repair the system image and file integrity.

    If the installation still fails, you will need to reset your local update cache by stopping the wuauserv service and renaming the C:\Windows\SoftwareDistribution folder to something like SoftwareDistribution.old. Restarting the service after renaming that directory forces Windows to re-evaluate the update requirements for KB5078740 from a clean slate.

    If you find my answer useful, please mark it as the "Accepted Answer" so other members can find the solution easily. Your help in supporting the community is much appreciated!
    Best regards,
    Scott Nguyen

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  2. Q&A Assist
    2026-04-07T15:00:16.7+00:00
    AI generated content. This question contains an answer created with AI from Q&A Assist. Learn more

    Error 0x80070306 is not described in the provided material, and there is no troubleshooting guidance for Windows client update failures for KB5078740 (build 26100.32522) in the context.

    References:

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