Unable to upgrade from 8.1 - Error 0xC1900101 – 0x20007

I tried upgrading from 8.1 x64 to 10 Preview, but after the installation gets to 83%, it shows an error code 0xC1900101 – 0x20007 and the installation rolls back. Any ideas on how to fix it?


Hi RicarDog,

Welcome to Windows 10 Technical Preview. You seem to have an issue with installing Windows 10 Technical Preview on your computer. Please answer the following questions to help me understand the issue better:

  1. What is the make and model of the computer?

  2. Are you upgrading the Windows to Windows 10 Technical Preview using the downloaded file or Windows Updates?

  3. Do you use a 3rd party antivirus application on your computer?

The most likely cause of this error is an incompatible driver or hardware defect critical for booting the intermediary environment necessary to perform upgrade actions. let’s troubleshoot the issue by referring to these methods and check the issue.

Method 1: Disconnect externally connected devices, try upgrading to Windows 10 Technical Preview and check if that helps.

Method 2: InstallWindows 10 Technical Preview buy keeping the computer in a clean boot status and check if that helps. This will help in fixing the issue if the issue specific to other applications conflict.

How to perform a clean boot to troubleshoot a problem in Windows Vista, Windows 7, or Windows 8.


Note: Please refer to the section: “How to reset the computer to start as usual after troubleshooting with clean boot” of the Kb article to boot the computer in normal startup after fixing the issue.

If you have installed a 3rd party antivirus application, disable it and check the issue status.

Important Note: Antivirus software can help protect your computer against viruses and other security threats. In most cases, you shouldn't disable your antivirus software. If you have to temporarily disable it to install other software, you should re-enable it as soon as you're done. If you're connected to the Internet or a network while your antivirus software is disabled, your computer is vulnerable to attacks.

You can also refer to the following link.

Before you install Windows Technical Preview.


Hope this helps. Please do let us know if you need further help.

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Question Info

Last updated April 8, 2021 Views 3,523 Applies to: