Windows 11 Version 25H2 Update Failing with Install Error 0xC1900101

Hi Shivam Jhariya,

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I understand how confusing it is to run into 0xC1900101 while trying to update Windows, then get told that it's because of lingering Insider components. This is unusual since this error is more often related to driver or compatibility issues. Simply having Insider history shouldn't prevent installation of a public Windows 11 feature update.

Just to make sure we're on the same page, I'd like to ask which Insider channel you were in? And have you clean-installed Windows when switched to the stable version yet? If the update downloads but rolls back during installation, Windows Setup has likely detected something it cannot migrate safely, so let's check the following:

1 - Run the update in a simpler environment

• Refer to How to perform a clean boot in Windows - Microsoft Support  
• Press Windows + R > type msconfig > press Enter
• Go to Services tab > Check Hide all Microsoft services > Disable all 
• Go to Startup > it will open Task Manager > Disable all items
• Restart your PC > Try to update Windows again within Clean Boot.

Disclaimer: A "clean boot" starts Windows with a minimal set of drivers and startup programs. It helps to determine whether a background service is interfering with your game or program and to isolate the cause of a problem. They might look complicated at first glance but can help you get back on track. To avoid any trouble, please follow them in order and step-by-step.   

 2 - Make sure everything else is up to date:

• Go to Settings > Windows Update > Advanced options > Optional updates 
• Visit your PC's manufacturer official website > look for BIOS and storage drivers
• Download and install all available packages (even if Windows says they're the latest).

3 - Check whether Insider configuration is actually gone since support mentioned Insider history

• Open Command Prompt as Administrator
• Run reg query "HKLM\SOFTWARE\Microsoft\WindowsSelfHost"
• If there are still WindowsSelfHost enrollment remnants > delete it
• Also check Win + R > enter winver to make sure current build is not Insider.

Disclaimer: Generally, modifying registry subkeys or work group is intended for advanced users, administrators, and IT Professionals. It can help fix some problems, however, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For further protection, first check out How to back up and restore the registry in Windows - Microsoft Support 

4 - Upgrade using the Windows 11 ISO instead of Windows Update

• Refer to Reinstall Windows with the installation media - Microsoft Support 
• Navigate to the bottom of the page and check In-place Upgrade > follow instructions. 
• Download the ISO > Mount it and run setup.exe as Administrator > select Keeping files and apps.

Disclaimer: An in-place install or in-place upgrade will refresh your Windows files and operating system without removing files or applications. That being said, we always recommend that if you have important data, you should back it up before making large system changes. You can also check out the guidance from one of the Moderators here: How to run In-place upgrade in Windows 11 - Microsoft Q&A 

It'd be helpful if you can also check in C:\$WINDOWS.~BT\Sources\ for Panther and Rollback (if available). They might reference to a specific driver (e.g. .sys file), device, or migration failure, helping determine what is the main issue here.

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