I have the same problem. font installation is on C:\Users\MyName\AppData\Local\Microsoft\Windows\Fonts folder. installation is not on c:/window/fonts
folder. When I delete .ttf in registry remove all references to them in "HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Fonts" and "HKEY_CURRENT_USER\Software\Microsoft\Windows, system get in strange status. does not show characters. again I copy .ttf from another pc and paste those. I am in normal state.