The Microsoft Office Diagnostics tool has been removed in version 2010. To initiate a repair for Microsoft Office 2010, you can go to Control Panel > Programs and Features > select Microsoft Office 2010 and click the Change button. Select the “Repair” radio button followed by Continue.
If you are unable to find Microsoft Office 2010 listed in the Programs and Features, you can trigger the installation menu with the repair option by running the Setup.exe file in the following location on your computer. You will need to right click on the Setup.exe file and run it as administrator.
"C:\Program Files\Common Files\microsoft shared\OFFICE14\Office Setup Controller\Setup.exe"