function SetPrivilege(aPrivilegeName: string;
  aEnabled: boolean): boolean;
var
  TPPrev,
    TP: TTokenPrivileges;
  Token: THandle;
  dwRetLen: DWord;
begin
  Result := False;
  OpenProcessToken(GetCurrentProcess, TOKEN_ADJUST_PRIVILEGES
    or TOKEN_QUERY, @Token);

  TP.PrivilegeCount := 1;
  if (LookupPrivilegeValue(nil, PChar(aPrivilegeName),
    TP.Privileges[0].LUID)) then
  begin
    if (aEnabled) then
      TP.Privileges[0].Attributes := SE_PRIVILEGE_ENABLED
    else
      TP.Privileges[0].Attributes := 0;

    dwRetLen := 0;
    Result := AdjustTokenPrivileges(Token, False, TP,
      SizeOf(TPPrev),
      TPPrev, dwRetLen);
  end;
  CloseHandle(Token);
end;

function WinExit(iFlags: integer): boolean;
//   возможные флаги:
//   EWX_LOGOFF
//   EWX_REBOOT
//   EWX_SHUTDOWN
begin
  Result := True;
  if (SetPrivilege('SeShutdownPrivilege', true)) then
  begin
    if (not ExitWindowsEx(iFlags, 0)) then
    begin
      Result := False;
    end;
    SetPrivilege('SeShutdownPrivilege', False)
  end
  else
  begin
    Result := False;
  end;
end;

OpenProcessToken(GetCurrentProcess, TOKEN_ADJUST_PRIVILEGES  or TOKEN_QUERY, @Token);

OpenProcessToken(GetCurrentProcess, TOKEN_ADJUST_PRIVILEGES  or TOKEN_QUERY, Token);