From HP's site:
Quote:
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Attain Microsoft's Certificate of Authenticity number (also know as the Product Key) for the Windows operating system. The recovery process may request the product key. The Certificate of Authenticity is on the cover of the Microsoft Windows book that was included with your system, or on a small sticker on the side of the HP Pavilion's chassis.
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If you have this key and a copy of the operating system it is for, you are good to go...everything else can be downloaded from HP (drivers, etc).