Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
The file that is causing this error is MSO.DLL You get this error message when it detects a pirated copy of Office that is installed on your computer. When you try to run a repair or even uninstallation, the setup wouldn’t touch the MSO.DLL file at all. That is why after repairing / uninstallation, you’ll still get the same error.
You can simply delete the current MSO.DLL located at C:\Program Files\Common Files\Microsoft Shared\OFFICE12 for Office 2007.Then do a repair or reinstallation of office 2007. That would restore the older version of MSL.DLL from the installation CD.