Hi,
Suggest trying this option to see if
it corrects the issue.
Settings, System, Recovery
Windows 11 Insider Preview Feature Update (26220.7344) Fails to install
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(60.8, 3%, 15%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDS%3C/text%3E%3C/svg%3E)
David Schoen
40
Reputation points
My PC starts to install Windows 11 Insider Preview Feature Update (26220.7344), but at the end, it uninstalls it and declares a failure. It retries the install and again fails. It has done this numerous times.
Windows Insider program | Windows Insider preview | Install, activate, and Windows update
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(32, 25%, 13%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ETD%3C/text%3E%3C/svg%3E)
Trevor Dwyer 10 Reputation points2025-12-10T00:04:41.74+00:00 I am experiencing the exact same problem and I have done everyting suggested on these pages and it still will not install.
The only thing I can think of that may be an issue is the Bios/FirmwareKeys are ready to be updated but havent actually been updated yet - but I'm grasping here as its never happened before like this.
Also I have found the download for the install of the build I am using is never avaialble. So I can't even reinstall the correct version of Windows.
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8 answers
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CrazyKats 13,815 Reputation points Volunteer Moderator2025-12-10T13:42:41.78+00:00 -
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(41.6, 81%, 14%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ENP%3C/text%3E%3C/svg%3E)
Nick P 0 Reputation points2025-12-10T18:03:10.8166667+00:00 not OP, but that option is unavailable for me
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(240, 0%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDB%3C/text%3E%3C/svg%3E)
David B 0 Reputation points2025-12-11T12:44:10.3166667+00:00 I have the same problem on my machine this is greyed out, presumably because it recovers back to the current version once the failure occurs. The update says it is 100% complete, then it reboots and fails. What logs should we investigate to find the real error? I have tried everything that I can find, still fails. I have checked the CBC log and cant find anything meaningful there. I have tried the Windows Update log via Event Viewer and the detail for all entries just shows %1 !
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David Schoen 40 Reputation points
2025-12-13T19:19:39.2066667+00:00 Option grayed out with the following statement "This option is currently unavailable."
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Q&A Assist2025-12-08T20:30:31.79+00:00 AI generated content. This question contains an answer created with AI from Q&A Assist. Learn moreIf your PC is repeatedly failing to install the Windows 11 Insider Preview Feature Update (26220.7344), there are several troubleshooting steps you can take:
- Check for Known Issues: Sometimes, specific updates may have known issues that can cause installation failures. You can check the Windows Insider Program's known issues page for any relevant notifications.
- Free Up Disk Space: Ensure that you have enough disk space available for the update. Insufficient space can lead to installation failures.
- Run Windows Update Troubleshooter: Use the built-in Windows Update Troubleshooter to identify and fix problems related to Windows Update.
- Reset Windows Update Components: Sometimes, resetting the Windows Update components can resolve installation issues. You can do this through Command Prompt by running specific commands to stop and restart the Windows Update services.
- Perform a Clean Boot: Booting your PC in a clean state can help eliminate software conflicts that might be causing the installation to fail.
- Reinstall the Insider Preview Build: If the issue persists, consider downloading the latest Insider Preview ISO and performing a clean installation. This can help if there are corrupted files in your current installation.
If none of these steps resolve the issue, you may want to seek further assistance through the Windows Insider Program support channels.
References:
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CrazyKats 13,815 Reputation points Volunteer Moderator
2025-12-08T20:32:44.86+00:00 Hi David,
What is the failing error shown?
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(304, 24%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMK%3C/text%3E%3C/svg%3E)
Mike K.® 0 Reputation points2025-12-10T04:32:49.17+00:00 I'll answer with permission for him, as I realize that more and more people are suffering from this problem
0x800f0991
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Nick P 0 Reputation points
2025-12-10T18:02:02.0033333+00:00 Not david, but I am getting
Install error - 0x8007001f
some googling pointed to possible partial profiles being a cause, but i do not have any in my system under system properties advanced, nor in the registry
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Johnny55 4,580 Reputation points Volunteer Moderator2025-12-08T20:39:41.72+00:00 Hello David,
Do you have any 3rd part AV running?
Suggest you run "sfc /scannow" in an administrative command prompt without the quotes.
Suggest also deleting the SoftwareDistribution\Download folder and then trying WU once more.
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Mike K.® 0 Reputation points
2025-12-10T04:29:39.5266667+00:00 Same problem and has been going on for a while. Error code is 0x800f0991
The above doesn't help, including dism and sfc. I haven't tried reinstalling, as it's a last resort, which I want to avoid if possible - at least for now. btw not running 3rd AV
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David Schoen 40 Reputation points
2025-12-13T19:15:58.9633333+00:00 Tried to delete the mentioned folder and I get the blue (Green) screen of death and the computer reboots.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(224.00000000000003, 32%, 31%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMK%3C/text%3E%3C/svg%3E)
Matthew Kasa 5 Reputation points2025-12-10T16:55:10.9333333+00:00 This must be a large install. It has failed about 10 times to install.
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Matthew Kasa 5 Reputation points
2025-12-11T17:48:01.6966667+00:00 I tried a few times today again. No good!
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