Public partial class MiServicio : ServiceBase
{

  Timer tmrServicio = null;

  public MiServicio ()
  {
    InitializeComponent();
    tmrServicio = new Timer (1000);
    tmrServicio.Elapsed += new ElapsedEventHandler(tmrServicio_Elapsed);
  }

  void tmrServicio_Elapsed(object sender, ElapsedEnvetArgs e)
  {
    VerificarAppIniciado();
  }

  protected override void OnStart(string[] args)
  {
   tmrServicio.Start();
  }

  protected override void OnStop()
  {
   tmrServicio.Stop();
  }

  void VerificarAppIniciar()
  {
        Process[] apps = Process.GetProcessesByName("sistemaventas");
        if (apps.Length == 0)
        {
            try
            {
                Process.Start(@"C:Archivos de programaMiAppsistemaventas.exe");
            }
            catch
            {
            }
        }
    }
}