Hello, Thanks for your answer.
But I cant find the folders and files described in this link.
*** RUN AFTER EFFECTS AS ADMINISTRATOR ***
Okay so this thread and question aren't exactly new, but I have had this same problem with After Effects CC. With both the 2017 update, and the previous version.
Both times, all I needed to do was RUN THE PROGRAMME AS ADMINISTRATOR.
Variations of this question are floating around the Adobe forums with incorrect answers... It appears to be a problem with most versions of After Effects.
Hopefully this answer saves someone from going through unnecessary uninstallation, reinstallation, restarting, font deletion, changing of permissions etc etc.