Как определить, установлен ли ScreenSaver?

function ScreenSaverEnabled: Boolean;
var
  status: Bool;
begin
  SystemParametersInfo(SPI_GETSCREENSAVEACTIVE, 0, @status, 0);
  Result := status = True;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  if ScreenSaverEnabled then
    Caption := 'Screensaver is enabled.'
  else
    Caption := 'Screensaver is disabled.'
end;