Installed Office2010 requires product key number again but doesn't accept it anymore

I bought Office2010 via HUP and installed it in my new laptop (with Windows7). Everything went fine and I made even settings to Outlook. Next time I tried to open Office2010 it asks me to activate  the product. When clicking the activate button the prompt says I need a valid Product Key. When filling the Product Key field (with a correct Key) it doesn't accept it.




Answer

Microsoft has a knowledge base article mentioned below that provides more information about the invalid product key scenario which you may refer:http://support.microsoft.com/kb/836178

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