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FIX: Windows Vista Activation – Product Key in Use

There are many reasons as to why your activation will not work on Windows Vista. To name a few, you have chosen an invalid way of installing Vista (You chose Custom instead of Upgrade) or you have ran the installation without typing in the Product Key.

Now when you get the prompt to activate Windows Vista, you get an error saying "Product Key already in use" - Do not fear, this does mean that Microsoft has given the same product key to someone else, it just means that the Product Key has already been registered on the server and therefore needs to be activated by Phone.