[t3mk4]

выполнить:
attrib -r -s %systemroot%\fonts
takeown /f "%systemroot%\fonts" /r /d n

Настроить UAC:
User Account Control: Behavior of the elevation prompt for administrators in Admin Approval Mode Elevate without prompting
User Account Control: Detect application installations and prompt for elevation Disabled
User Account Control: Only elevate UIAccess applications that are installed in secure locations Disabled
User Account Control: Run all administrators in Admin Approval Mode Disabled

Выдать права на изменение пользователю:
%SystemRoot%\system32\FNTCACHE.DAT
%SystemRoot%\Fonts
и реестра
MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts