It is due to expiry of th trial period for the office suite application. You will have to enter the 25 character full version product key to unlock it or else you will to purchase the full version product key online.
Alternative way is to uninstall the trial version of Microsoft Office 2007 Standard edition an install the office 2010 trial edition which will be valid for another 60 days.
To download trial office 2010 suite:
http://office.microsoft.com/en-us/try/
OR
You can use the open office suite which is absolutely free. The open office suite will provide the same feature and functionality as the Microsoft office suite.
To download open office suite:
http://download.openoffice.org/other.html
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