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Windows 11 Installation Error Error Code: 0xC1900101 0x40021

Anonymous
2023-10-19T06:25:57+00:00

I tried upgrading Windows 10 to Windows 11 using "Check for updates Menu in Settings" and "Windows Installation Assistant" but both fail at the end with the error:

Error Code: 0xC1900101 0x40021

The installation failed in the SECOND_BOOT phase with an error during SYSPREP_RESPECIALIZE operation

I read a thread about this error and said to generate a new thread because each PC got different solution.

Please Help...

The pc is fully compatible in the pc Health Check WIndows 11 requirements.

Windows for home | Windows 11 | Install and upgrade

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Ramesh 176.5K Reputation points Volunteer Moderator
2023-10-20T03:25:46+00:00

Hi Felix,

Uninstall FolderMill, and delete the folder "C:\Program Files (x86)\FolderMill".

That should fix the issue.

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  1. Anonymous
    2023-10-20T06:43:52+00:00

    Nice.

    Image: FolderMill Processor.exe

    Thx

    How did you differentiate service vs driver?

    Absence of loaded drivers?

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  2. Anonymous
    2023-10-20T02:00:46+00:00

    Thanks Ramesh for quick reply.

    Here's the link to the zip file :

    https://www.dropbox.com/scl/fo/7v8d8shtni5jtci4tpbei/h?rlkey=jhgf4f1wwutafzbulgcw6rmmy&dl=0

    Best Regards

    FJ

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  3. Anonymous
    2023-10-19T06:53:48+00:00

    Please run the V2 log collector and post a share link into this thread using one drive, drop box, or google drive.

    https://www.tenforums.com/bsod-crashes-debugging/2198-bsod-posting-instructions.html

    https://www.elevenforum.com/t/bsod-posting-instructions.103/

    Make sure that share links are available without sign in.

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  4. Ramesh 176.5K Reputation points Volunteer Moderator
    2023-10-19T06:36:53+00:00
    • Open the "C:$WINDOWS.~BT\Sources" folder.
    • Select the two folders, "Panther" and "Rollback" (if present).
    • Copy the two folders to the desktop and Zip them.
    • Upload the zip file to OneDrive/Dropbox/WeTransfer.
    • Share the download link here.

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