If you have a legitimate copy of Office, you will have a Product Key. That is what you use for activation. Pre-installed copies of Office are usually trial versions that expire if you don't supply the Product Key (which you have to purchase) to activate it. AFAIK, though, there never was a trial version of Office 2010.
Have you tried repairing the Office installation (via Start > Windows Control Panel > Programs > Programs & Features > Microsoft Office (version) > Change > Repair)?
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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