A repair installation via Settings should resolve the issue.
Launch Settings > System > Recovery. Under "Fix problems using Windows Update", select "Reinstall now."
This does a repair installation, keeping your files, apps, and settings.
More info:
Windows 11, version 25H2 not installed
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Ernst
50
Reputation points
Windows 11, version 25H2 not installed
A Windows 11 update was released today, but it didn't install for me. It says "Failed to install: 10/17/2025 – 0x80070306"
installed Malwarebytes and PC Manager two weeks ago Windows failed to install the following update with error 0x80070306: 2025-10 Cumulative Update for Windows 11 Version 24H2 for x64-based Systems (KB5066835) (26100.6899) and this cumulative update also did not install.
The Windows Update troubleshooter isn't working.
help solve the problem
Windows for home | Windows 11 | 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(153.6, 85%, 24%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ER%3C/text%3E%3C/svg%3E)
Radisson 30 Reputation points2025-10-19T03:26:40.9233333+00:00 Windows 11 25H2 (Repair Version) KB5066835 Update for x64 Based Systems.
I have tried troubleshooting online suggestions, they all failed, and the one that worked is this:
- Click on Setting (Wheel)
- System
- Recovery
- Fix Problem Using Windows Update
- Reinstall Now (25H2 Repair Version)
This is a large update. Be patient. It might take some time to complete. Make sure to save your files and close all programs before proceeding. It will reinstall windows without erasing anything.
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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(252.8, 94%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ENA%3C/text%3E%3C/svg%3E)
Nicholas Alford 0 Reputation points2025-10-23T21:39:59.0966667+00:00 Outstanding advice. This was driving me crazy. Very grateful for this simple fix
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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(112.00000000000001, 25%, 20%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ETS%3C/text%3E%3C/svg%3E)
troy s 5 Reputation points2025-11-14T02:10:07.74+00:00 This worked for me although since I had 24H2 installed it was slightly different.
- Click on Setting (Wheel)
- System
- Recovery
- Fix Problem Using Windows Update
- Reinstall Now (24H2 Repair Version)
Try this before factory resetting your computer. After spending 2 plus hours with MS support where they just kept retrying installation and nothing else, they recommended the nuclear option of factory reset. I knew Windows 11 had the Recovery option and I wanted to try that first; glad I did.
I had previously tried the scan now option, pausing/restarting windows update, etc. None worked except this.
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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(275.2, 84%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EVD%3C/text%3E%3C/svg%3E)
Vivek Dixit 0 Reputation points2025-11-20T10:24:25.99+00:00 It worked for me. It took about 2+hrs to complete the update. Finally, 25H2 is installed on my PC. Thanks to Radisson.
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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(268.8, 59%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMC%3C/text%3E%3C/svg%3E)
Mr coolrunin 0 Reputation points2025-12-07T16:32:19.3833333+00:00 Thank you Radisson - Your instructions solved my issue. The process took 2.5 hours.
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Answer accepted by question author
Ramesh
181K
Reputation points
Volunteer Moderator
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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(35.2, 51%, 13%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJD%3C/text%3E%3C/svg%3E)
Jack Durrett 0 Reputation points2025-10-21T02:37:16.1+00:00 I have run this update 8 times and fails every time. Error message 0xc1900101(?) every time. It takes an hour and a half every time! The recovery failed, just like all the rest.
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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(275.2, 86%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJP%3C/text%3E%3C/svg%3E)
joebert pandeng 5 Reputation points2025-10-24T10:02:52.3333333+00:00 stuck at 25% and after that failed
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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(211.20000000000002, 57.00000000000001%, 30%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EF%3C/text%3E%3C/svg%3E)
Frakiec 0 Reputation points2025-11-25T00:39:59.9133333+00:00 Здравствуйте! После обновления до последней версии Windows 11 25H2, заметил то, что при монтировании образа программы через эммулятор привода сторонних программ, например UltraISO или же PowerISO ображ отображается в эммуляторе привода, но при замуске инсталятора выдает такую ошибку то, что файл не найден, хотя он присутствует. В чем может быть проблема, в обновлении? В версии windows 11 24H2 все работало.
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Frakiec 0 Reputation points
2025-11-25T06:59:08.9833333+00:00 Это я уже понял то, что можно через PowerShell или через стороннюю программу winCDemu смонтировать. Но мне хотелось бы знать почему такая проблема возникла, дело в моих корявых руках или же в обновлении Windows 11 25H2?
P.S.: Да и спасибо за то, что подсказали, что через проводник windows можно также монтировать виртуальные приводы. Не знал об этом, до этого как-то привык использовать UltraIso. Еще раз благодарю за способ.
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4 additional answers
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Kapil Arya 38,446 Reputation points Volunteer Moderator2025-10-18T16:28:26.84+00:00 You can try manual upgrade using Windows 11 25H2 ISO file. Follow these steps:
Download Windows 11 25H2 ISO from Microsoft website.
Double click on it to mount it to a DVD drive.
Then go to DVD drive, double click on setup.exe to proceed.
Follow on-screen instructions to complete upgrade.
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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(41.6, 56.00000000000001%, 14%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDM%3C/text%3E%3C/svg%3E)
David McIntyre 0 Reputation points2025-10-24T20:58:28.4966667+00:00 This was the only solution to the problem. I tried all the other so-called solutions and even had a Microsoft tech try to fix it. I went to the website and downloaded the assistant and then the media creator and then the windows 11 25H2 ISO. Rather than mounting it to DVD, I just opened it and ran it. It worked great!!! I didn't lose a thing, and windows update is working fine now. Thanks so much! I give this solution 10 stars!
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Ernst 50 Reputation points
2025-10-19T13:35:07.8666667+00:00 Thank you Radisson and Ramesh
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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(300.8, 59%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMS%3C/text%3E%3C/svg%3E)
Mite Suo 5,470 Reputation points Independent Advisor2025-10-18T16:27:35.6433333+00:00 You can try cleaning the cache of Windows Update. Here are the steps:
Search for "Command Prompt" in the search bar and open it, then enter the following commands:
net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
ren C\Windows\SoftwareDistribution SoftwareDistribution.old
ren C\Windows\System32\catroot2 catroot2.old
net start wuauserv
net start cryptSvc
net start bits
net start msiserver
Reset your computer, and try updating again. See whether this work.
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Jack Durrett 0 Reputation points
2025-10-24T00:16:47.03+00:00 I tried it. Doesn't work. Microsoft needs to explain this update, what it is supposed to fix, why it needs to fix whatever needs fixing, and a better update that isn't so sensitive to something that Microsoft doesn't know about. Jack Durrett
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Mite Suo 5,470 Reputation points Independent Advisor
2025-10-18T09:52:35.5833333+00:00 I'm Mite. I'm here to help.
It's possible that there are some corrupted files preventing the system from updating. You can try repairing the system by following these steps:
Search for "Command Prompt" in the search bar, then right-click it and select "Run as administrator". After opening the command prompt, enter the following command:
DISM /Online /Cleanup-Image /RestoreHealth
The command above can help you download the necessary files for repair. Then, enter:
sfc /scannow
This command scans for corrupted system files. You might need to wait a little bit longer at a certain stage (around 69%). This is normal. Please wait patiently for the scan to complete.
After repairing the system, please try updating again.
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Ernst 50 Reputation points
2025-10-18T10:04:44.49+00:00 There are no problems in the system, it didn't help.
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Jack Durrett 0 Reputation points
2025-10-21T03:07:16.6566667+00:00 Like Ernst, no problems found in the system, it didn't help.
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Jack Durrett 0 Reputation points
2025-10-24T00:14:57.3266667+00:00 I did all the above steps. It still failed. Microsoft needs to build a new Updater.
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