Cannot install Windows 11 - Error 0xc1900101

Anonymous
2021-06-28T21:21:32+00:00

I am trying to install the new Windows 11 update from Windows Update, but I keep getting error 0xc1900101.

The installation starts, and after a couple restarts, it says:

" Attempting to recover installation "

" Undoing changes made to your computer "

And then I am greeted with error 0xc1900101 on Windows Update.

Windows for home | Windows 11 | Install and upgrade

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  1. Anonymous
    2021-06-30T12:35:50+00:00

    I've solved it! I have two SSDs on my PC, and I remove the after one（Toshiba 512G）, and it works! If you have two SSDs too you can try it

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  2. Anonymous
    2021-06-30T12:42:11+00:00

    i tried removing all drives other than my main one and it didnt solve the issue. thanks for the suggestion though

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  3. Anonymous
    2021-06-30T21:25:58+00:00

    Same problem here. The Health Check utility (when it was still available) reported my PC can't run Windows 11 (due to the TPM requirement) but since it's already part of the Insider Dev channel it's supposed to be able to download the new Preview release.

    However, it keeps trying to download and install, and fails every time and rolls back with the 0xc1900101 error. I sent in a report via the Feedback Hub but it got added to the general collection about the TPM 2.0 requirement.

    Is there a way to prevent the update from constantly trying to install? Or is it just a waiting game to see if Microsoft decides how to handle this?

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  4. Anonymous
    2021-06-30T22:50:15+00:00

    The Health Check utility reports that the PC I am attempting to install Win 11 on meets all the requirements for Win 11. It has TPM 2.0 implemented via firmware in the processor (AMD Ryzen 3200G), and is confirmed by the Health check facility. However, no matter what I try, it ends the installation with a rollback to Win 10. Hopefully, the folks at Microsoft will have some suggestions as to what we can do to get Win 11 to install. I sent them the logs that the installation produced, so hopefully they will have a solution. You don't have to attempt to install Win 11 again, at least not until we get a workaround, or a new version of the Win11 preview that fixes this problem. The update does not try to force another installation on my PC, unless I ask it to try again. As this is the first preview, I imagine the engineers are quite busy working on reported bugs, so we may have to wait a bit for some suggestions or a fix.

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  5. Anonymous
    2021-07-01T01:13:10+00:00

    Good point: I checked and the update is "ready to download." I thought it had tried at least twice on its own, but maybe I did something to trigger those attempts. I'll leave it like that and hopefully won't have to deal with long reboots/re-attempts. Maybe if they push a new release it will install correctly. This does give me a chance to decide if I want to install this preview build, knowing that at the end of the preview I'll have to do a clean re-install of Windows 10.

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