In order to fix the issue, go to Start, type winword /safe in the Search programs and files field and open the program. If it opens, navigate to File > Options > Add-Ins and click the Go button next to Manage. Uncheck one by one the plugins and try to use the software. If it doesn't open in safe mode, or if it doesn't work after you disable the plugins, go to Start > Control Panel > Uninstall a program, select the Office Suite from the list, click the Repair button next to Uninstall and follow the on-screen instructions. If you still have issues, I suggest you contact the Microsoft Support team.