Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi Nicolas,
Thank you for choosing Microsoft Community. I will help you in providing the steps to determine the cause of the issue so that you can install Office 2010 successfully.
What is version and edition of Office suite currently installed currently on the computer?
It looks like there might be corrupted installation files for Office on the computer.
Refer the Method 2 and run the FIX IT to remove any traces of Office suite manually from the computer.
Office 2003 Suite: http://support.microsoft.com/kb/2639197#Method2
Office 2007 Suite: http://support.microsoft.com/kb/928218#Method2
Office 2010 Suite: http://support.microsoft.com/kb/290301#Method2
If you have Office 2010 Click-to-Run based edition, refer the following link to remove Office Click-to-Run:
Once removed, restart the computer in Clean Boot and install Office 2010 suite. Refer the article on How to restart the computer in Clean Boot:
http://support.microsoft.com/kb/929135
Note: Restart the computer to normal mode after the Office 2010 is installed on the computer.
If the issue persists, reply and I will be happy to help you further.
Thank You.