{ 
  For some functions you need to get the right privileges 
  on a Windows NT machine. 
  (e.g: To shut down or restart windows with ExitWindowsEx or 
  to change the system time) 
  The following code provides a procedure to adjust the privileges. 
  The AdjustTokenPrivileges() function enables or disables privileges 
  in the specified access token. 
} 

// NT Defined Privileges from winnt.h 

const 
  SE_CREATE_TOKEN_NAME = 'SeCreateTokenPrivilege'; 
  SE_ASSIGNPRIMARYTOKEN_NAME = 'SeAssignPrimaryTokenPrivilege'; 
  SE_LOCK_MEMORY_NAME = 'SeLockMemoryPrivilege'; 
  SE_INCREASE_QUOTA_NAME = 'SeIncreaseQuotaPrivilege'; 
  SE_UNSOLICITED_INPUT_NAME = 'SeUnsolicitedInputPrivilege'; 
  SE_MACHINE_ACCOUNT_NAME = 'SeMachineAccountPrivilege'; 
  SE_TCB_NAME = 'SeTcbPrivilege'; 
  SE_SECURITY_NAME = 'SeSecurityPrivilege'; 
  SE_TAKE_OWNERSHIP_NAME = 'SeTakeOwnershipPrivilege'; 
  SE_LOAD_DRIVER_NAME = 'SeLoadDriverPrivilege'; 
  SE_SYSTEM_PROFILE_NAME = 'SeSystemProfilePrivilege'; 
  SE_SYSTEMTIME_NAME = 'SeSystemtimePrivilege'; 
  SE_PROF_SINGLE_PROCESS_NAME = 'SeProfileSingleProcessPrivilege'; 
  SE_INC_BASE_PRIORITY_NAME = 'SeIncreaseBasePriorityPrivilege'; 
  SE_CREATE_PAGEFILE_NAME = 'SeCreatePagefilePrivilege'; 
  SE_CREATE_PERMANENT_NAME = 'SeCreatePermanentPrivilege'; 
  SE_BACKUP_NAME = 'SeBackupPrivilege'; 
  SE_RESTORE_NAME = 'SeRestorePrivilege'; 
  SE_SHUTDOWN_NAME = 'SeShutdownPrivilege'; 
  SE_DEBUG_NAME = 'SeDebugPrivilege'; 
  SE_AUDIT_NAME = 'SeAuditPrivilege'; 
  SE_SYSTEM_ENVIRONMENT_NAME = 'SeSystemEnvironmentPrivilege'; 
  SE_CHANGE_NOTIFY_NAME = 'SeChangeNotifyPrivilege'; 
  SE_REMOTE_SHUTDOWN_NAME = 'SeRemoteShutdownPrivilege'; 
  SE_UNDOCK_NAME = 'SeUndockPrivilege'; 
  SE_SYNC_AGENT_NAME = 'SeSyncAgentPrivilege'; 
  SE_ENABLE_DELEGATION_NAME = 'SeEnableDelegationPrivilege'; 
  SE_MANAGE_VOLUME_NAME = 'SeManageVolumePrivilege'; 

// Enables or disables privileges debending on the bEnabled 
function NTSetPrivilege(sPrivilege: string; bEnabled: Boolean): Boolean; 
var 
  hToken: THandle; 
  TokenPriv: TOKEN_PRIVILEGES; 
  PrevTokenPriv: TOKEN_PRIVILEGES; 
  ReturnLength: Cardinal; 
begin 
  Result := True; 
  // Only for Windows NT/2000/XP and later. 
  if not (Win32Platform = VER_PLATFORM_WIN32_NT) then Exit; 
  Result := False; 

  // obtain the processes token 
  if OpenProcessToken(GetCurrentProcess(), 
    TOKEN_ADJUST_PRIVILEGES or TOKEN_QUERY, hToken) then 
  begin 
    try 
      // Get the locally unique identifier (LUID) . 
      if LookupPrivilegeValue(nil, PChar(sPrivilege), 
        TokenPriv.Privileges[0].Luid) then 
      begin 
        TokenPriv.PrivilegeCount := 1; // one privilege to set 

        case bEnabled of 
          True: TokenPriv.Privileges[0].Attributes  := SE_PRIVILEGE_ENABLED; 
          False: TokenPriv.Privileges[0].Attributes := 0; 
        end; 

        ReturnLength := 0; // replaces a var parameter 
        PrevTokenPriv := TokenPriv; 

        // enable or disable the privilege 

        AdjustTokenPrivileges(hToken, False, TokenPriv, SizeOf(PrevTokenPriv), 
          PrevTokenPriv, ReturnLength); 
      end; 
    finally 
      CloseHandle(hToken); 
    end; 
  end; 
  // test the return value of AdjustTokenPrivileges. 
  Result := GetLastError = ERROR_SUCCESS; 
  if not Result then 
    raise Exception.Create(SysErrorMessage(GetLastError)); 
end;