Is it a newish laptop? It sounds to me like you have a free trial version of Office 2010, which you may not have realised, and have also installed Office 2003. The free trial of 2010 has now run out, which is why it wants you to activate it (i.e. pay for it...) If you want to keep 2003 and lose 2010 - which I'm guessing you do - then you should be able to uninstall 2010 from add/remove programs.
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