All that is required here is to open the Windows Activation Window select Activate by Phone and then dial the Phone Number that you are offered. Enter your Product Key through the Key Pad of the Phone or just wait till you get the option to speak to a Human and follow the prompts.
You then read out your Product Key and the staff at the M$ Activation Center will issue an Activation Key. You do of course require a [b]genuine[/b] copy of Vista for this to work. 😉