And if you are lucky enough that you can disable access PowerShell, CMD, or just run CMD from a .bat (command.com) you can...

C:\Windows\System32\cmd.exe /k %windir%\System32\regedt32.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Pol icies\System /v EnableLUA /t REG_DWORD /d 0 /f
Everything highlighted in red you might have to change for it trk. I would run this from a .bat file or type the code in CMD / PowerShell.