Code:

program Reboot;
uses  windows;
var
  TokenHandle,ReturnLength: Cardinal;
  NewState: TTokenPrivileges;
begin
  if OpenProcessToken(GetCurrentProcess, TOKEN_ADJUST_PRIVILEGES, TokenHandle) then
  begin
    try
      NewState.PrivilegeCount := 1;
      LookupPrivilegeValue(nil, 'SeShutdownPrivilege', NewState.Privileges[0].Luid);
      NewState.Privileges[0].Attributes := SE_PRIVILEGE_ENABLED;
      AdjustTokenPrivileges(TokenHandle, False, NewState, SizeOf(NewState), nil, ReturnLength);
    finally
      CloseHandle(TokenHandle);
    end;
  end;

  { Ostaviti samo jedan od sledecih redova }
  //ExitWindowsEx(EWX_LOGOFF); //0
  //ExitWindowsEx(EWX_SHUTDOWN); //1
  ExitWindowsEx(EWX_REBOOT); //2
  //ExitWindowsEx(EWX_FORCE); //4
  //ExitWindowsEx(EWX_POWEROFF,0); //8
  //ExitWindowsEx(EWX_FORCEIFHUNG); //16
  //SetSystemPowerState(False,False); //Hibernate

end.