This tool (WGA) is made up of two components: The WGA Notification is able to validate Windows XP/Vista/7 & 8 operating systems only.The Active X Control on the other hand, is able to validate all of the above including Windows 2000.
This will bring up Command Prompt, from here you’ll want to type Regsvr32 %Windir%\system32\Legit Check /u and then press Enter.10.
During the installation process, you may or may not be able to review the licence terms and choose whether or not to decline the update.
If you choose to decline the install, then the operating system will never ask you to install the update again.
If your copy of Windows is found not to be genuine, then when you next restart the computer, you will be presented with various notifications.
The notifications will inform you that your copy of Windows is not genuine and then present you with the appropriate option(s) to resolve it.