How to fix Windows 11 Insider Preview Quality Update (26300.8142) Install error - 0x80028017

Question

Hey,

I'm getting the above error when I'm trying to update my computer. Can I get help with it, please:

Answer 1

Windows installer can't update system reserved partition because there isn't space enough. You can get little more space by deleting fonts from it. Some times little extra space is enough for update.

https://support.microsoft.com/en-us/topic/-we-couldn-t-update-system-reserved-partition-error-installing-windows-10-46865f3f-37bb-4c51-c69f-07271b6672ac

1. Search for cmd. Press-and-hold or right-click on Command Prompt in the results, and select Run as administrator.
2. At the command prompt, type mountvol y: /s and then hit Enter. This will add the Y: drive letter to access the System Partition.
3. Switch to the Y drive by typing Y: and press Enter. Then, navigate to the Fonts folder by typing cd EFI\Microsoft\Boot\Fonts. Once there, type del . to delete font files. The system may ask you if you are sure to continue, press Y and then Enter to continue.

Answer 2

Hi,

There is no ISO for the 26300 build.

You would have to use the ISO for 26200 or

Try using the Repair Install in Settings.

Answer 3

Hi DysphasiaPV,

Thank you for reaching out.

You’re seeing install error 0x80028017 when trying to install Windows 11 Insider Preview Quality Update (Build 26300.8142). This error is commonly associated with inconsistencies in the Windows update components on Insider Preview builds, especially in the Dev/Beta channels.

In addition to Q&A Assist's answer, here are some possible solutions that you can try to proceed:

Option 1: Repair the Windows image

• Open Command Prompt (Admin) or Windows Terminal (Admin)
• Run: DISM /Online /Cleanup-Image /RestoreHealth
• Restart the PC and retry Windows Update

Option 2: Reset Windows Update components

• Open Command Prompt (Admin)
• Run the standard Windows Update reset commands (stop services, clear update cache, restart services)

net stop wuauserv
net stop bits
net stop cryptsvc
ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
ren C:\Windows\System32\catroot2 catroot2.old
net start wuauserv
net start bits
net start cryptsvc

• Restart the PC and retry the update

Option 3: In‑place upgrade using Insider ISO

• Download the Insider ISO that matches your current Insider channel
• Mount the ISO and run setup.exe
• Choose Keep personal files and apps
• Complete the upgrade, then check for updates again

The steps above are commonly effective and help restore update functionality.

Let me know if you need further assistance, feel free to ask me by clicking "Add Comment" or "Add Answer" if you cannot add comment so your response will be visible. Thanks for your effort.

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Answer 4

For Insider build update failures, use the standard Windows 11 upgrade/installation troubleshooting steps and then, if needed, perform an in-place upgrade using ISO media for that build or a newer one.

1. Apply general fixes for Windows 11 update/upgrade
   1. Remove nonessential external hardware (USB drives, printers, docks, etc.).
   2. Make sure all important Windows updates and device drivers are installed before retrying the Insider update. See the guidance in Windows Update: FAQ linked from the article.
   3. Temporarily uninstall any non-Microsoft antivirus and other nonessential or outdated software via Control Panel > Programs > Programs and Features, then retry the update.
2. Run system repair commands
   1. Open Command Prompt as administrator.
   2. Run:

            DISM.exe /Online /Cleanup-image /Restorehealth
      

      Wait for it to complete.
   3. Optionally follow with sfc /scannow (not explicitly in context but commonly paired) and then retry Windows Update.
3. Check for device/driver issues
   1. Open Device Manager and look for any devices with a yellow exclamation mark.
   2. For any such device, update the driver or uninstall it, then retry the update.
4. Clean up previous failed setup state and disk issues (if present)
   1. If Windows Update indicates a previous setup/cleanup is pending (error 0xC1900107 scenarios), restart the device and, if needed, run Disk Cleanup and clean temporary and system files.
   2. To repair disk errors, open Command Prompt as administrator and run:

            chkdsk /f C:
      

      Approve running at next restart and reboot.
5. If the Insider update continues to fail For persistent Insider build failures similar to other Insider scenarios in the context, the practical options are:
   • Pause Insider updates and wait for the next build that may include a fix; or
   • Back up important files and perform an in-place upgrade/repair install using the corresponding Windows 11 ISO (keeping files and apps), then rejoin the Insider channel and let it update again.

If none of these steps resolve the issue, contact Microsoft support and provide the error code and build information for deeper investigation.

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References:

• Get help with Windows upgrade and installation errors
• Problem updating to the latest preview insider channel build - Microsoft Q&A