Hi Pollyo - Sounds to me as if you have been a victim of Automatic Updates. There was a M$ update several weeks ago called 'Office Genuine Advantage notifications" which would have been automatically applied to your machine if you had 'updates' set that way.
The update was marked as 'Important' but in reality was merely a means for M$ to check your computer for non-genuine versions of Office. Unfortunately, 'OGA' has proved to be less than 100% accurate and has identified some genuine Office installations as illegitimate.
Check through your updates list and if this one appears you may have to contact M$ direct in order to clear it up.
cheers...JIM
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