Windows SLUI not working

Have you entered to the command line or run dialog "slui" or "slui 4" and nothing happend? This can be caused by wrong license key. When you have before entered license key which is for teachers, students, developers or another license which is distributed elecronic and is not allowed for selling, then slui = "activation over the telephone", will not show. I advice you to make a call to the Microsoft Licensing Activation Centerand check the license key.

Here are some of the phone numbers: https://www.microsoft.com/en-us/licensing/existing-customer/activation-centers