Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Which edition of Office did you purchase (Office home and student 2010, Office home and business 2010, or Office professional 2010)?
Did you purchase a retail copy of Office 2010?
If yes, how are you trying to install Office using the disc or the downloaded installation source file?
If you are installing Office using the disc
Create a new folder on the computer, copy the entire contents of the disk (Click on Start > Computer > Right click on DVD drive > Copy) to a new folder on the desktop and then run the installation from the setup file in the folder and check if it works fine.
If the above steps fail download Office 2010 using the link below and install using your product key.