I have installed windows 7 professional operating system on my DELL Inspiron 6400 laptop. I have also activated my operating system by providing the product key. I want to install windows 7 ultimate pack on my desktops so I want to know if I can use the same product key to activate windows 7 ultimate pack which was used for activating windows 7 professional pack. I need a solution for this problem so that I can install windows 7 ultimate pack and also activate it.
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