windows 11version 25H2 (Install error - 0xc1900101) Please fix this

Question

I Manoj Kumar am very worried about this problem, please fix it somehow.

Answer 1

0xc1900101 is usually driver-related issue. Please share your Farbar scan logs for analysis.

• Download Farbar Recovery Scan Tool 64-bit FRST64.exe
• If the OS language is not English, rename FRST64.exe to FRST64English.exe.
• Run the program. Don't check or uncheck any options. Click "Scan".
• Add the two logs, FRST.txt and Addition.txt, to a zip archive.
• Share the zip file on OneDrive or GoFile.io, and post the link here.

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Note: If Microsoft Edge or Chrome mislabels the Farbar Scanner executable as PUA/malware, choose to keep it by tapping … in the bottom bar, choosing Keep, and then choosing Keep anyway in the dialog that appears. See this screenshot. It's a safe tool used in most antimalware forums.

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Standard Disclaimer: There is a link to a non-Microsoft website. The page appears to provide accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as PUPs (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

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Answer 2

Error 0xC1900101 during a Windows 11 25H2 install is usually a driver-related problem. Use this order to troubleshoot it:

1. Free up disk space
   • Make sure the device has at least 16 GB free for 32-bit Windows or 20 GB free for 64-bit Windows.
2. Run Windows Update again
   • Go to Settings > Windows Update.
   • Install all available updates, including hardware and third-party driver updates.
   • If 25H2 is offered, try the install again.
3. Disconnect nonessential hardware
   • Unplug external drives, USB storage, docks, printers, scanners, speakers, and other devices not required for basic use.
4. Check Device Manager for driver problems
   • Search for Device Manager from the taskbar.
   • Look for devices with a yellow exclamation mark.
   • Right-click the device and choose Update Driver Software or Uninstall.
5. Remove third-party antivirus or security software
   • Non-Microsoft security software can block upgrades.
   • Go to Control Panel > Programs > Programs and Features, uninstall it, then retry the upgrade.
   • Make sure installation media or activation details are available before removal.
6. Remove nonessential software
   • Old or unnecessary applications can interfere with setup.
   • Uninstall apps that are not needed for the upgrade from Control Panel > Programs > Programs and Features.
7. Run disk repair
   • Open Command Prompt as an administrator.
   • Run:

          chkdsk /f C:
     

   • Restart when prompted.
   • Note: this requires administrator permissions and will schedule disk repair on restart.
8. Repair the Windows image
   • Open Command Prompt as an administrator.
   • Run:

          DISM.exe /Online /Cleanup-image /Restorehealth
     

9. Perform a clean boot and retry the upgrade
   • Start Windows with third-party apps and services disabled, then run the 25H2 upgrade again.
   • This helps identify software conflicts during setup.
10. Try the update again from Windows Update

• Go to Settings > Windows Update.
• If Get the latest updates as soon as they’re available is turned on, the update is delivered automatically.
• If it is off, select Download & Install when 25H2 appears.

11. If the issue continues, report it

• Use the Feedback Hub app to report the Windows update problem.

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References:

• Get help with Windows upgrade and installation errors
• Windows 11, version 25H2 known issues and notifications