Recently my Microsoft Office 2010 has started saying my copy of Microsoft is not activated even though i have been using it for over a year now, the error code is 0xC004F074. Office came with my computer when i bought it so i do not have the activation key, and when i press the change product key it says the setup controller has encountered a problem during install.
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This is something you'll have to take up with Microsoft. Your PC manufacturer should be able to provide you with the product key as well.