Warning message when multilingual user interface (MUI) pack is installed in incorrect edition of Windows 7: "This copy of Windows is not genuine"


When you try to install updates or files from the Microsoft Download Center, you may receive a "This copy of Windows is not genuine" warning message in Windows 7. Also, when you try to validate Windows 7 from the Genuine Microsoft Software site, the validation attempt may be unsuccessful.

Additionally, this warning message may contain one of the following validation error codes:



This issue may occur when the following conditions are true:
  • Multilingual User Interface (MUI) packs are installed that provide additional display languages.
  • You have one of the following editions of Windows 7 installed:


    Home Basic

    Home Premium

Multilingual User Interface (MUI) packs are supported on, licensed for, and available for Windows 7 Ultimate and Windows 7 Enterprise editions. If these language files are present on another edition of Windows 7, Genuine Windows technologies will detect tampering on the system and then display the "This copy of Windows is not genuine" warning message.

To determine whether these conditions are present on your computer, follow these steps:

Step 1: Determine the Windows Edition

  1. Click StartStart button .
  2. Right-click Computer.
  3. Click Properties.
If the current operating system Edition for Windows 7 is Starter, Home Basic, Home Premium, or Professional, continue to the "Step 2: Determine whether an MUI pack is installed" section to determine whether an MUI pack is installed on the computer.

Step 2: Determine whether an MUI pack is installed

  1. Click StartStart button , type regedit in the Start Search box, and then press ENTER.
  2. If the User Account Control dialog box appears, click Continue.
  3. Locate and then double-click the following registry subkey:
  • If more than one language appears under this subkey, an MUI pack is installed. For more information, see the "Resolution" section.
  • If only one language appears under this subkey, or the current operating system is Windows 7 Ultimate or Windows 7 Enterprise, the information that is provided in this article will not resolve your issue. In this case, for more information about genuine Windows 7, please visit the following Microsoft website:


Note The resolution methods that are presented in this article will revert the operating system to its original language. The language may not be one that you understand.

Method 1

If a third-party program was used to install the MUIs, you can use the same program to uninstall the MUIs. After you uninstall the MUIs, restart the computer, and then revalidate the operating system at the following Microsoft website:

Method 2

If you cannot locate or use the third-party program to uninstall the MUI, and you need help, contact Microsoft Support. An agent can help you determine whether an MUI is installed on your computer and how to uninstall it.

More Information

After the MUI language packs are uninstalled or after Windows 7 is reinstalled, the operating system reverts to its original language. In some cases, you may not be familiar with this language. In this scenario, use one or more of the following options:For more information about MUIs, visit the following Microsoft website:

For more information about the update for Windows Activation Technologies, click the following article number to view the article in the Microsoft Knowledge Base:

971033 Description of the update for Windows Activation Technologies

Article ID: 2105247 - Last Review: Oct 14, 2010 - Revision: 1