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Why is it every time I try to open Microsoft Excel it shows up something saying "Locate your product key"?  What should I do?

Hovsep A
2014-04-03 18:10:06
Support for Microsoft Office for Mac 2011 and 2008http://support.microsoft.com/ph/12853/en-ca
Oron J
2014-03-19 13:09:05
Is this on a Mac or PC?