Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Do you get the error message while installing Office or activating Office?
Which is the suite of Office did you purchase?
If you get the error message while installing Office then uninstall Office completely from the system by running the fixit tool from the link given below:
http://support.microsoft.com/kb/290301
If you get the error message while activating Office 2010 then refer the link given below and Check the troubleshooting steps provided by Ganesh Kumar N:
Important: Ensure to back up the registry before deleting the keys from the registry. Refer the link given below to back up the registry: