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http://forums.microsoft.com/Genuine/ShowPost.aspx?PostID=618120&SiteID=25
The Genuine Advantage Product Key Update Tool is only valid for users attempting to change their current non-genuine Product Key to a genuine COA sticker or genuine Product Key - all without a reinstall!
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http://go.microsoft.com/fwlink/?LinkId=50346&clcid=0x409
Download and run the WGA Diagnostic Tool and verify your serial number
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http://go.microsoft.com/fwlink/?linkid=52012