Windows Product Key Update Tool Instructions
So what happens if you get a customer who has failed Windows Genuine Advantage? You want to sell them a genuine copy of Windows but they don't want to lose their data. Do you know we have a tool that helps you change the Windows product key without having to reinstall? Don't worry, this tool will scan a number of key Windows files to determine if they have been tampered with.
You can get the tool from the following link:
https://www.microsoft.com/genuine/selfhelp/PKuInstructions.aspx?displaylang=en
Victor Mux