Windows 7 activation error: invalid product key If you receive an error indicating that your product key is not valid when installing Windows 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 of Windows 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. You can't use a product key for Windows 7 with Service. Install Clockingit En_windows_8_x64_dvd_915440 there.

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