Uninstalling and re-installing will not help with this issue! The problem is most likely an Add-In that is not installed or uninstalled with Word but is added to Word by some other program.

Read the article on Add-Ins. See if you can temporarily disable any that are installed and try making and saving a change, perhaps a simple test AutoText.

If that is too much for you, use the methods on the page to open your normal.dot template. With that template open, save a change to a style or save a macro. Then save the template. (Note, no text, not even a date or header or footer should be in the normal.dot template. AutoText is fine, though.)