For a wide variety of reasons, you may see errors pop up in Microsoft Office when trying to use 3rd party tools.
Usually the messages are somewhat technical in nature, like
"Class does not support Automation" or "Error in loading DLL."
The errors can be caused when the installation doesn't quite
complete everything it needs to, or where a conflict exists
between multiple Office installations. Fortunately
Microsoft Office has a fairly comprehensive repair
capability that can seek out these anomalies and put your
Office installation back in working order.
Repairing Office 2010 and higher is accessible
only from the Add/Remove programs component in the Windows Control
Panel. Open the Windows Control panel, and select "Add/Remove
Programs" ("Uninstall Programs" in Windows 7). Right-click the
"Microsoft Office ####" item and select "Change." When the
Office installation dialog appears, select "Repair."