If you receive an error indicating that your product key is not valid when installingWindowsÂ 7, it could be for the following reasons:
You might have mistyped your product key. Try retyping it.
You might be using a product key that doesn’t match the version ofÂ WindowsÂ 7 that’s installed on your computer. Check the product key to make sure it is for the version that you are trying to activate.
The product key is for an upgrade version ofÂ WindowsÂ 7 and a previous version ofWindows wasn’t on your computer whenÂ WindowsÂ 7 was installed. To install an upgrade version ofÂ WindowsÂ 7,Â WindowsÂ Vista orÂ WindowsÂ XP must be 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 activateÂ WindowsÂ 7. To activateWindowsÂ 7, you’ll need to install your previous version ofÂ Windows, and then reinstallWindowsÂ 7. For help with the activation process, go to theÂ Microsoft Support website.
For more information aboutÂ WindowsÂ 7 activation errors, seeÂ Windows 7 activation error: 0xC004F061.