Answer Question
All Pre-requisites of Smart Word4TFS is installed but still it is not working , why?
If all prerequisites are installed and still Smart Word4TFS doesn’t get load, then uninstall Smart Word4TFS, PIA and VSTO respectively, and then install again Smart Word4TFS. All required pre requisites would be installed by Smart Word4TFS installer itself and in correct sequence.
*This case happens mostly in Office 2007, make sure all Release Notes mentioned patch are installed.
*It is highly recommended to use same or higher version of Team Explorer/Visual Studio as of Team Foundation Server. SmartOffice doesn't support "standalone TFS client for 2013".