I entered in the product key # but it is telling me that the key is invalid.

Hi,

Please make sure the Product key matches the product that you want to activate, and the Product key characters are not mistyped.

Since I'm not sure what version of Office you need to activate, here are some references for you:

Invalid product key type errors occur in Microsoft Office 2007 or 2003

http://support.microsoft.com/kb/2549291

Invalid product key errors in Microsoft Office

https://support2.microsoft.com/kb/836178

For more details, I suggest you contact your local Customer Service phone number:

http://support2.microsoft.com/gp/customer-service-phone-numbers/en-us

Regards,

Melon Chen
TechNet Community Support