подскажите такая вещь есть процедура

 public void TestDownlads()
        {
            countTheared = 0;
            timer.Interval = new TimeSpan(0, 0, 1);
            timer.Tick += new EventHandler(timer_Tick);
            timer.Start();
            for (int i = 0; i < 10; i++)
            {
                DownloadProcess proce = new DownloadProcess();
                proce.OnFinishDownload += new FinishDownloadDelegate(proce_OnFinishDownload);
                proce.StartByte = countTheared;
                countTheared += 1024;
                proce.EndByte = countTheared;
                proce.OnException += new ExceptionDelegate(proce_OnException);
                proce.StartTest();
            }

        }

        void proce_OnException(long Messeng, long Source, long StackTrace, bool Tail)
        {
            DownloadProcess proce = new DownloadProcess();
            proce.OnFinishDownload += new FinishDownloadDelegate(proce_OnFinishDownload);
            proce.StartByte = Messeng;
            proce.EndByte = Source;
            proce.OnException += new ExceptionDelegate(proce_OnException);
            proce.StartTest();
        }
        int countTheared = 0;
        void proce_OnFinishDownload(long parametrs, bool Tail, long lDownloads)
        {
            countTheared++;
            long testmb = (1024*1024)*1000;
            if (countTheared < testmb)
            {
                DownloadProcess proce = new DownloadProcess();
                proce.OnFinishDownload += new FinishDownloadDelegate(proce_OnFinishDownload);
                proce.StartByte = countTheared;
                countTheared += 1024;
                proce.EndByte = countTheared;
                proce.OnException += new ExceptionDelegate(proce_OnException);
                proce.StartTest();
                summ = countTheared/1024;
            }
            else
            {
                MessageBox.Show("Test Finish");
            }
        }


И сама процедура потока

public void StartTest()
        {
            m_Terminated = false;
            FinishDownloadThread = false;
            CloseDW = false;
            if (downloader != null)
            {
                if (downloader.ThreadState == ThreadState.Stopped)
                {
                   
                    m_EvSuspend = new ManualResetEvent(true);
                    downloader = new Thread(new ThreadStart(downloadTest));
                    downloader.IsBackground = true;
                    downloader.Start();

                }
               
            }
            else
            {
                m_EvSuspend = new ManualResetEvent(true);
                downloader = new Thread(new ThreadStart(downloadTest));
                downloader.IsBackground = true;
                downloader.Start();
            }

        }

 void downloadTest()
        {

            HttpWebResponse webResponse = null;
            HttpWebRequest webRequest = null;
            Stream strResponse = null;


            try
            {
                Type _TypeHttpWebRequest = typeof(HttpWebRequest);
                object[] args = new object[3];
                Random r = new Random();
               
                webRequest = (HttpWebRequest)WebRequest.Create("http://www.bl/wmv/vid.wmv");
                args[0] = "bytes";
                int MethodI;
                args[1] = StartByte.ToString();
                long total = EndByte - 1;
                args[2] = total.ToString();
                MethodInfo[] _method = _TypeHttpWebRequest.GetMethods(BindingFlags.Instance | BindingFlags.NonPublic);

                for (MethodI = 0; MethodI < _method.Length; MethodI++)
                {

                    if (_method[MethodI].Name == "AddRange") break;

                }
                
                _method[MethodI].Invoke(webRequest, args);


                webRequest.Credentials = CredentialCache.DefaultCredentials;
                //webRequest.Timeout = 10000;

                webResponse = (HttpWebResponse)webRequest.GetResponse();
                strResponse = webResponse.GetResponseStream();



                Dispatcher.CurrentDispatcher.Invoke(DispatcherPriority.Normal, new FinishDownloadDelegate(this.OnFinishDownload), 1024, new object[] { true, 10 });

            }
            catch
            {
                Dispatcher.CurrentDispatcher.Invoke(DispatcherPriority.Normal, new ExceptionDelegate(this.OnException), StartByte, new object[] { EndByte, 0, true });

            }
            finally
            {

                if (m_EvSuspend != null)
                {
                    m_EvSuspend.Close();
                }

                if (webRequest != null)
                {

                    webRequest.Abort();
                }
                if (webResponse != null)
                {
                    webRequest.Abort();
                }
                if (strResponse != null)
                {

                    strResponse.Close();
                }
            }
        }

Проблема в том что после того как прокачала около 10 000 kb программа перестает качать и винда ложится т.е. выключается на мышке правая кнопка, горячие клавиши ...
Подскажите как можно выйти из ситуации ?