Press Enter on the keyboard and wait for the command to complete.Restart your PC and try to change product key again.
This post tells you how to recover files by using the Command Prompt tool. Click on the OK button or press Enter on the keyboard.Click Yes in the User Account Control window to allow Windows Activation.In addition, you can try to add the product key during the installation.
You should copy & paste the product key during the installation, instead of choosing to skip it and activating later on.
