PlatformNotSupportedException using .NET Speech Recognition

So I am trying to recognize voices in C #, I am using System.Speech.Recognition and I have searched the internet trying a few snippets of code for some basic speech recognition, the best one I found was this:

using System;
using System.Text;
using System.Windows.Forms;
using System.Speech.Recognition;

namespace SpeechRecognition
{
    public partial class MainForm : Form
    {

        SpeechRecognitionEngine recognitionEngine; 


        public MainForm()
        {
            InitializeComponent();

            Initialize();
        }

        private void Initialize()
        {
            recognitionEngine = new SpeechRecognitionEngine();
            recognitionEngine.SetInputToDefaultAudioDevice();
            recognitionEngine.SpeechRecognized += (s, args) =>
            {
                foreach (RecognizedWordUnit word in args.Result.Words)
                {
                    // You can change the minimun confidence level here
                    if (word.Confidence > 0.8f)
                        freeTextBox.Text += word.Text + " ";
                }
                freeTextBox.Text += Environment.NewLine;
            };
        }

        private void startButton_Click(object sender, EventArgs e)
        {
            try
            {
                recognitionEngine.UnloadAllGrammars();
                recognitionEngine.LoadGrammar(new DictationGrammar());
                RecognitionResult result = recognitionEngine.Recognize(new TimeSpan(0, 0, 20));

                if (result != null)
                {
                    foreach (RecognizedWordUnit word in result.Words)
                    {

                        freeTextBox.Text += word.Text + " ";
                    }
                }

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void startAsyncButton_Click(object sender, EventArgs e)
        {
            recognitionEngine.UnloadAllGrammars();
            recognitionEngine.LoadGrammar(new DictationGrammar());
            recognitionEngine.RecognizeAsync(RecognizeMode.Multiple);
        }



        private void stopButton_Click(object sender, EventArgs e)
        {
            recognitionEngine.RecognizeAsyncStop();
        }


        private void startAsyncGrammarButton_Click(object sender, EventArgs e)
        {         
            try
            {
                recognitionEngine.UnloadAllGrammars();

                Grammar cg = CreateSampleGrammar();
                recognitionEngine.LoadGrammar(cg);
                recognitionEngine.RecognizeAsync(RecognizeMode.Multiple);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }


        private Grammar CreateSampleGrammar()
        {
            Choices commandChoices = new Choices("Calculator", "Notepad", "Internet Explorer", "Paint");
            GrammarBuilder grammarBuilder = new GrammarBuilder("Start");
            grammarBuilder.Append(commandChoices);
            Grammar g = new Grammar(grammarBuilder);
            g.Name = "Available programs";
            return g;
        }

    }
}

      

        
        
        
      

    

Now I tried this and some others and they all resulted in the same error - PlatformNotSupportedException, in the error message: "No resolver installed".

Is there a way to get around this? I have Windows 7 64-bit.