Try renaming the Normal.dotm template to OldNormal.dotm and then re-start Word and see if it overcomes the problem,
The Normal.dotm template will be located in the
C:\Users[User Name]\AppData\Roaming\Microsoft\Templates
folder.
If you do not see the AppData folder: -
In Windows 7, - In Windows Explorer, click on the Organize drop down and then on Folder and search options and in the Folder Options dialog, go to the View tab and select the item "Show hidden files, folders, and drives". While there, it is a good idea to
uncheck the box for "Hide extensions for known file types".
In Windows 8, 8.1 or 10, in the File Explorer, click on Options on the View tab of the ribbon and then on the View tab in the dialog that appears and select the item "Show hidden files, folders, and drives". While there, it is a good idea to uncheck the box
for "Hide extensions for known file types".