Hi ,I use microsoft surface pro x . current versopn 24h2 i am unable to install the 25h2 update since beginning of this error. manytime i factory reset as well as insubserb the review option still not corrected. now again opted for review verssion and trying to update which showing in windows update as 2622220.9022 . it failed to installed . still trying again and again download. some of the log here i atteched . please give solution . setupact 1.txt
Updating to Windows 11, version 25H2 always fails with error 0xc1900101
![](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(214.4, 22%, 30%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMR%3C/text%3E%3C/svg%3E)
Michal Rama
40
Reputation points
Hello,
I have an active Insider Preview for Windows 11 Home. Specifically the Release Preview version (advanced option set to Windows 11, 26H1). Windows Update currently offers me Windows 11, 25H2.
The download and installation seem fine, when restarting it also seems normal, but it takes an extremely short time and when starting Windows, Windows Update only shows the installation error 0xc1900101.
Of course I can repeat the update, but the result is the same.
ChatGPT advised me to try updating the graphics drivers and BIOS. I did both, but the result is the same again.
How exactly do I solve this problem, please?
Thank you
PS. Windows 11 Home Insider Preview, Version 26H2, OS build 26300.8935
Windows Insider program | Windows Insider preview | Install, activate, and Windows update
2 answers
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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(249.60000000000002, 75%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ERM%3C/text%3E%3C/svg%3E)
RATHNAKARA MAHABALA SUVARNA 0 Reputation points2026-08-03T09:43:51.86+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(208, 2%, 30%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ELV%3C/text%3E%3C/svg%3E)
Lucus-V 10,425 Reputation points Microsoft External Staff Moderator2026-08-03T16:11:17.5233333+00:00 Hi RATHNAKARA MAHABALA SUVARNA,
While your issue may appear similar to the one discussed in this thread, it could have a different underlying cause. To ensure you receive the most accurate assistance, please consider creating a new thread and providing the details of your specific situation.
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Lucus-V 10,425 Reputation points Microsoft External Staff Moderator
2026-08-02T18:08:11.2766667+00:00 Hi Michal Rama,
The error code
0xc1900101indicates that the system might have corrupt files or components.Please try reinstalling the current version of Windows to fix your system following this article: Fix issues by reinstalling the current version of Windows.
Then try the suggestions in this topic: How can I switch from Windows 11 Insider Preview to Windows 11 Standard without losing my apps and data? I already tried a repair upgrade but it failed.
If you have further information, please feel free to let me know.
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Lucus-V 10,425 Reputation points Microsoft External Staff Moderator
2026-08-03T16:09:28.1033333+00:00 Hi Michal Rama,
I hope everything is going well on your end. Just wanted to check in and see how things are going for you lately, anything you'd like to share or discuss?
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