Hi,
What’s the edition of your Office program? Is it a retail program?
According to Microsoft's EULA, if this is a retail version, we can only install one copy of software on one computer.
If you encounter any problems when trying to activate the Office product, you can contact Microsoft activation center, and they will check it for you. For the detailed
information on how to contact Microsoft Activation Center, you can refer to this Microsoft Knowledge base article:
How to contact a Microsoft Product Activation Center
http://support.microsoft.com/kb/950929
Best Regards,
Sally Tang