1. Windows Central Question's Avatar
    Upgrading from Windows 7 to Windows 10
    09-08-2015 02:39 PM
  2. stevesu's Avatar
    I searched for C1900101 4000d in Bing and found the following:
    <from here: http://answers.microsoft.com/en-us/windows/forum/windows_10-windows_install/installation-failure-c1900101-4000d/bd84affa-b70d-46d8-b164-6f1f4de39c5b?auth=1>

    It means your installer was not able to pick the installation files while upgrading.
    I suggest you to place the computer in clean boot, disable Antivirus and then upgrade using an ISO.
    Try the following steps:
    Step 1: How to perform a clean boot in Windows: https://support.microsoft.com/en-us/kb/929135
    Note: The steps apply for Windows 10 as well.
    Step 2: Disable antivirus software:
    Disable antivirus software - Windows Help
    Note 1: Make sure to enable Antivirus after the troubleshooting.
    Note 2: After the troubleshooting is done make sure to refer the section " How to reset the computer to start normally after clean boot troubleshooting" from the Clean boot article.
    Now, you may try to upgrade from here:
    Windows 10
    09-08-2015 03:06 PM

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