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Windows Update Error: Update failed 0x800f0805

Alan... -  
 Alan -

Hello,

I have an issue with Windows Update. An update is not installing and I have error code 0x800f0805.

I tried the procedure available on a YouTube channel, but without success.

I have screenshots with the "results" of these procedures.


If anyone can help me with this restoration process.

Thank you.

4 answers

  1.
    fabul Posted messages 42164 Registration date   Status Moderator Last intervention   6 066
     

    Hello,

    By right-clicking on the Start button, use this command with Windows PowerShell (Admin)

    CHKDSK /F C:

    Reply Y for Yes to then restart Windows.

    Then

    Dism /Online /Cleanup-Image /RestoreHealth

    Then

    sfc /scannow

    Then check here: https://learn.microsoft.com/fr-fr/troubleshoot/windows-client/installing-updates-features-roles/additional-resources-for-windows-update#reset-windows-update-components-manually

    If it's too complicated or doesn't work, you can perform a repair without losing data or applications.

    To do a repair without losing data or an upgrade, use either the MediaCreationTool to download the Windows 10 ISO file. (For another PC)

    Or you can download the Windows 11 ISO file directly if compatible.

    You can check if it's compatible with WhyNotWin11

    https://github.com/rcmaehl/WhyNotWin11/releases

    Windows 10
    https://www.microsoft.com/fr-fr/software-download/windows10/

    Windows 11
    https://www.microsoft.com/fr-fr/software-download/windows11

    Once the ISO file is downloaded, open it with 7-Zip and extract everything into a new folder anywhere except directly on C:\

    https://www.7-zip.org/download.html

    Click on the setup.exe that is in the extracted folder.

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    1. Alan
       

      Hello fabul and thank you for your response.

      Sorry for the time it took me to reply, in the meantime I had an issue with my laptop's battery. I was getting error messages and had to remove it.

      As for what you're asking me, I believe I have already done some of these manipulations. I will redo everything and come back with the results.

      Thank you for your help, have a great day.

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    2. Alan
       

      Hello,

      It's been a while but I've had issues that prevented me from taking care of this problem.

      I'm a novice in computer science and the things you're asking me, especially from

      "If it's too complicated or doesn't work out" completely overwhelm me.

      Since then, the problem persists (the same update is displayed but it's still impossible to download and install) and another identical update "22H.." refuses to install but doesn't show any error code.

      ?

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    3. fabul Posted messages 42164 Registration date   Status Moderator Last intervention   6 066 > Alan
       

      Has Windows Update on Windows 10 ever offered you the Windows 11 update?

      Or said that your PC is not compatible?

      You need the Windows 10 ISO file if 11 is not compatible.

      The Microsoft Media Creation Tool allows you to download an ISO file by selecting (For another PC).

      Then, once downloaded, mount it in File Explorer or Open with > Windows Explorer

      And click on setup.exe

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    4. Alan > fabul Posted messages 42164 Registration date   Status Moderator Last intervention  
       

      Hello,

      I received a message stating that my PC does not have the specifications to upgrade to Windows 11.

      I did not understand the rest of your message. I don't know what an ISO file is, etc.

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    5. fabul Posted messages 42164 Registration date   Status Moderator Last intervention   6 066 > Alan
       

      An ISO file is a "disk image" of an optical disc CD / DVD / Blu-ray.

      In our case, that of Windows.

      If Windows 11 is not compatible, you can use Windows 10 instead.

      And keep it for the future, so you don't have to search for it and download it again.

      It can be used to burn a DVD-R DL (Dual Layer)

      To create a bootable USB drive with Rufus or Ventoy or others...

      To install or repair Windows from scratch.

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  2. Kori-Kori Posted messages 2404 Registration date   Status Member Last intervention   413
     

    Good evening everyone,

    It would be nice to know where you stand with Windows?

    Please, right-click on the Windows logo at the bottom left

    Run

    Type winver

    Ok

    Let us know!

    Example

    Thanks, we'll see later.

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  3. fabul Posted messages 42164 Registration date   Status Moderator Last intervention   6 066
     

    For one of the updates, your WinRE partition is too small for this WinRE update.

    It’s the last partition on the right next to your C: drive. If you download AOMEI Partition Assistant Standard, or Macrorit Partition Expert Free, or EaseUS Partition Master Free, or others...

    To start, you should reduce the C: partition by 1GB (let's say) to increase the partition on the right by at least 1GB; less than 2GB will be sufficient.

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    1. Alan
       

      Hello,

      I don't know what you're talking about as I told you I know almost nothing about it.

      And sorry for the response time, my PC has become so slow that I'm having a hard time using it (the updates keep wanting to install and they keep increasing in number).

      Can you help me step by step with the procedure to follow?

      I'm now almost certain that it's DELIBERATE on Microsoft's part, trying to force us to switch to Windows 11 by buying a new PC!

      I hate this company :(

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    2. fabul Posted messages 42164 Registration date   Status Moderator Last intervention   6 066 > Alan
       

      Can you capture the WhyNotWin11.exe found at this link

      https://github.com/rcmaehl/WhyNotWin11/releases/tag/2.6.1.1

      So we can see why it is not compatible with Windows 11

      You can take a screenshot with Greenshot and upload it to Cjoint to give us the link afterwards?

      https://getgreenshot.org/downloads/

      https://www.cjoint.com/

      If it's just an MBR disk issue with Boot Method: Legacy, it can be fixed.

      But there are indeed things that become obsolete.

      You can hide updates with wushowhide.diagcab

      https://www.majorgeeks.com/files/details/wushowhide.html

      Or you can completely block updates with StopUpdates10

      https://greatis.com/stopupdates10/

      You can reinstall Windows from scratch

      Use the MediaCreationTool to download a Windows 10 ISO file (For another PC). For Windows 11, if compatible, it can be downloaded directly to create a USB drive of 8GB or more for upgrading, repairing, or installing Windows

      Windows 10
      https://www.microsoft.com/fr-fr/software-download/windows10/

      Windows 11
      https://www.microsoft.com/fr-fr/software-download/windows11

      When you have the Windows ISO file, you can create a Bootable USB drive with Rufus

      https://rufus.ie/fr/

      If the PC is old, create the drive in MBR mode

      If it is recent (Windows 8 or higher) in GPT mode > For Windows 11 GPT

      Boot from it using the PC's Boot Menu key

      You can search on Google "[Brand Model] Boot Menu Key"

      Choose "Custom Installation" (Not upgrade)

      No need to format if there is space, if there are data, they will be found in a Windows.old folder (Which will be automatically deleted after 10 days)

      Install on the same partition, or alternatively, delete all system partitions and create a new one (Deletes data).

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    3. bwerp > Alan
       

      Hello, I am in the same situation and I think exactly the same thing; it is the consequence of a lack of competition in the field of computer operating systems.

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    4. Alan > fabul Posted messages 42164 Registration date   Status Moderator Last intervention  
       

      Hello fabul,

      There's some news. It seems (it appears certain) that the issue comes from my very old and outdated BIOS.

      I don't know how to update it safely and with peace of mind (password request..).

      Can you help me?

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    5. fabul Posted messages 42164 Registration date   Status Moderator Last intervention   6 066 > Alan
       

      We cannot help you recover a forgotten BIOS password, whether it was set by you or not.

      The only feasible option would be to perform a Clear CMOS to simply reset the BIOS, which is easy if it's a desktop, but much less so with a laptop.

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  4. Alan
     

    Hello Kori-Kori,

    As I told fabul, other updates have been refusing to install since then. And the PC is increasingly experiencing bugs and slowdowns.

    One of the other updates has finally encountered the same error code 0x800f0805 as the first.

    For my Windows version:

    Windows 10

    Version 22h2 (operating system build 19045.4842)

    (I was unable to post a screenshot)

    Thank you

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    2. pierro
       

      I have exactly the same problem with the same version of W10 Version 22h2 (operating system build 19045.4842). None of my attempts have yielded any results. Moreover, a previous update KB5042320 installed a few days ago continues to be presented for download and installation by Windows Update.

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