本人亲测，很好很强大！属于正常关机，重启后不自检。
program Project1;

uses Windows;
//提权
function RtlAdjustPrivilege(Privilege: ULONG; Enable: BOOLEAN;
CurrentThread: BOOLEAN; Enabled: PBOOLEAN): DWORD; stdcall; external 'ntdll.dll';
//调用关机函数
function ZwShutdownSystem(arg: DWORD): BOOLEAN; stdcall; external 'ntdll.dll';

begin
asm
PUSH ESP
PUSH 0
PUSH 1
PUSH $13
CALL RtlAdjustPrivilege
PUSH 0
CALL ZwShutdownSystem
end;
end.