To remove all traces of those f%^&ing 'assistants' you need to delete the folder that stores them.
Go to the folder under Program Files in which M$ Word is installed.
Under the Word installation folder will be another one called 'Assistants' or 'Characters' or similar. Can't quite remember. If you delete that folder in toto then you'll no longer have those bastard things intrude.
Even better, all the help options eg F1 will default back to standard help functions & windows.