Latest Security Update KB5079473 (26200.8037) Fails to Install

Doug Golden 75 Reputation points

Have downloaded and attempted to install multiple times with continued error 0x800f0991. What should I do to fix this problem?

  1. Doug Golden 75 Reputation points

    The issue self corrected this morning and was able to install without using any of the options below.

  2. dilkhush kumar jha 10 Reputation points

    I am getting this error Install error - 0x80070002. Not able to install anything and having no brightness control options.

  3. Sandra Goulet 30 Reputation points

    When installing KB507473 I am getting the same error Install error - 0x80070002. I have tried numerous fixes and nothing works. Only having this issue on one machine.

  4. JardaB 20 Reputation points

    The KB5079473 update did not complete; it reported a problem, twice returning the system to its previous state and restarting. Fortunately, the system booted up, and the Update indicates a failed update with an offer to repeat.

    winver 26.200.7840 --- Avast

  5. brian agne 25 Reputation points

    I have been trying since 3/10 and it has not self-resolved.

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Answer recommended by moderator

Doug Golden 75 Reputation points

Another Update: I had to do a iso in place reinstall to get my system back to operation. The update corrupted my Outlook program and a few other things.

  1. Simon Fincher 0 Reputation points

    I tried all the various solutions and found that the in-place reinstall was the only way I could get out of the failed update loop. Everything's now updated and seems to work ok, but it took approximately two hours to get things back to normal.

  2. After security update (KB5079473) (26200.8037) the network folder is not visible from my player

  3. Sean Brimigion 0 Reputation points

    We also ended up doing an in-place upgrade with one of our users, jumping the device from 24H2 to 25H2. Seemed to work at first, but then the device was showing the update as being available again. Hasn't happened with a fresh 25H2 image; it seems to only affect 24H2 devices already in production. I wonder if this has been the case for anyone else?

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3 additional answers

  1. Robert Maksym 0 Reputation points

    No third party antivirus. Windows 11 version 25H2 (OS Build 26200.8037). Screen shot does not work.

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  2. Robert Maksym 0 Reputation points

    I cannot open office 365. I cannot find nor open any windows files.

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  3. David-M 115.3K Reputation points β€’ Independent Advisor

    Hi. I'm David, and I'm happy to help you.

    Please clarify the following:

    Do you have a third-party antivirus installed? If yes, which one?

    Also. What is the current "OS Build" of your Windows 11?

    • Press "Windows + R", type winver, and click OK.

    If you prefer, share a screenshot. Use the shortcut "Windows + Shift + S" to use the screenshot tool.

    Be sure to censor your email address if it appears. The Microsoft Q&A is public.

    I await your reply.

    1. Γ…smund MΓΈll Frengstad 5 Reputation points

      I'm experience the same issue and no external anti virus installed.

    2. Donald Sangster 100 Reputation points

      I have also had this issue and have uninstalled KB5079473 and blocked updating as it tries to automatically reinstall. The computer crashed 4 times in 24 hours, it has never done so before.

      Windows version s5H2 (OS Build 26200.7840)

      I do not have third party antivirus.

    3. Donald Sangster 100 Reputation points

      Minidump file is loaded to Dropbox: https://www.dropbox.com/t/LQwmyEej99D8u2yP

    4. _AW_ 67,926 Reputation points β€’ Volunteer Moderator

      @Donald Your dump is from last September which is long before this current issue and therefore not relevant.

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