Threading Problems in Windows Form

Question

I’m trying to implement Threads in my algorithm, however when adding and running my software the Windows Form of it hangs and does not perform any action, can you see anything wrong in the code below? I know there’s a Async/Await to be used with the task, but it is possible to use Threads as I used, on Windows Form? If not, what would be the best way to add a pool of task that would "take" at least 90% of my processor to run the algorithm?

Thanks in advance!

    GeneticAlgorithm AG = new GeneticAlgorithm();
    List<Thread> threads = new List<Thread>();

    for (i = iTemp; i < evolucoes; i++)
    {
        Thread thread_corrente = new Thread(() =>
        {
            #region
            iTemp++;

            lbEvolucoes.Text = i.ToString();
            lbEvolucoes.Refresh();

            pop = AG.executeGA(pop);

            if (twoOptCheck.Checked)
            {
                if (i == evolucoes - 1)
                    Utils.TwoOpt(pop.getBest());
            }
            pop.getBest().CalcFitness();

            //Limpar o grafico
            zedMedia.GraphPane.CurveList.Clear();
            zedMedia.GraphPane.GraphObjList.Clear();

            double mediaPop = pop.getMediaPop();
            mediaPopulacao.Add(i, mediaPop);

            double bestFitness = pop.getBest().getFitness();

            lbMenorDistancia.Text = bestFitness.ToString("0.0");
            lbMenorDistancia.Refresh();

            LineItem media = paneMedia.AddCurve("Média", mediaPopulacao, Color.Red, SymbolType.None);

            //Print linhas a cada 6 evolucoes
            if (i % 6 == 0 && bestFitness < bestAux)
            {
                bestAux = bestFitness;
                g.Clear(Color.White);
                plotLines(pop, Color.Blue);
                plotPoints();
            }

            zedMedia.AxisChange();
            zedMedia.Invalidate();
            zedMedia.Refresh();
            #endregion
        });

        thread_corrente.Start();
        threads.Add(thread_corrente);
        if (threads.Count >= 10)
        {
            while (!ThreadsTerminaramDeProcesssar(threads))
            {
                Thread.Sleep(5000);
            }

            threads.Clear();
        }
    }

    g.Clear(Color.White);
    plotLines(pop, Color.Blue);
    plotPoints();

    btnExecutar.Enabled = true;
}

Checks if Thread has already processed:

   private bool ThreadsTerminaramDeProcesssar(List<Thread> threads)
    {
        bool TodosTerminaramDeProcessar = true;

        foreach (Thread thread in threads)
        {
            //true => não terminou seu processamento.
            //false => terminou seu processamento.
            if (thread.IsAlive)
                TodosTerminaramDeProcessar = false;
        }

        return TodosTerminaramDeProcessar;
    }