If you see 0xC004F061 error code during Windows 7 activation, it means that you are using an upgrade product key for Windows 7 but there were no previous versions of Windows were installed on the system. Windows 7 upgrade keys work only when you are upgrading to Windows 7 from any earlier versions of Windows such as XP or Vista, but if you didn’t have any earlier version installed on your system, the activation will not be completed and you will be served with an error notification : 0xC004F061.
To install an upgrade version of Windows 7 either of Windows Vista or Windows XP must have been installed on your computer. If you formatted the drive before starting the installation process, you won’t be able to use the upgrade product key to activate Windows 7. To activate Windows 7, you have to install a previous version of Windows and then reinstall Windows 7.
You should always install Windows 7 with your current version of Windows running. You can check more details on Windows 7 activation error: invalid product key.
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