BadImageFormatException 0x800700C1

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C#

DirectX

Hi Everyone.
Im building an project using Visual studio 2008 express c#. Basically im trying to catch audio via directsound on Window 7 x64 using the below code but it is giving me the error:
BadImageFormatException is not a valid Win32 application. (Exception from HRESULT: 0x800700C1)

Can anyone see where ive went wrong with my code or how i could fix this issue?
I've set it to compile using x86 rather than x64 or AnyCpu but have tried those aswell

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using Microsoft.DirectX.DirectSound;

namespace USBGlowLightDirectX
{
    public partial class Form1 : Form
    {
        WaveFormat waveFormat = default(WaveFormat);
        CaptureBuffer _dwCapBuffer = default(CaptureBuffer);
        AutoResetEvent _resetEvent = new AutoResetEvent(false);
        Notify _notify = default(Notify);
        Int32 _dwOutputBufferSize;
        Int32 _dwCaptureBufferSize;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //Setup the Capturing Format
            waveFormat.SamplesPerSecond = 96000;
            waveFormat.BitsPerSample = 16;
            waveFormat.Channels = 2;
            waveFormat.FormatTag = WaveFormatTag.Pcm;
            waveFormat.BlockAlign = (short)(waveFormat.Channels * (waveFormat.BitsPerSample / 8));
            waveFormat.AverageBytesPerSecond = waveFormat.SamplesPerSecond * waveFormat.BlockAlign;

            var _dwNotifySize = Math.Max(4096, waveFormat.AverageBytesPerSecond / 8);
            _dwNotifySize -= _dwNotifySize % waveFormat.BlockAlign;
            _dwCaptureBufferSize = _dwNotifySize;
            _dwOutputBufferSize = _dwNotifySize / 2;

            //Setup the Capture Buffer
            var cap = default(Capture);
            var cdc = new CaptureDevicesCollection();
            for (int i = 0; i < cdc.Count; i++)
            {
                if (cdc[i].Description.ToLower().Contains("Stereo Mix".ToLower()))
                {
                    cap = new Capture(cdc[i].DriverGuid);
                    break;
                }
            }
            var capDesc = new CaptureBufferDescription
            {
                Format = waveFormat,
                BufferBytes = _dwCaptureBufferSize
            };
            _dwCapBuffer = new CaptureBuffer(capDesc, cap); //This is the Capture Buffer

            //setup buffer notifications to allow buffer to reset when full

            var bpn1 = new BufferPositionNotify();
            bpn1.Offset = _dwCapBuffer.Caps.BufferBytes / 2 - 1;
            bpn1.EventNotifyHandle = _resetEvent.SafeWaitHandle.DangerousGetHandle();
            var bpn2 = new BufferPositionNotify();
            bpn2.Offset = _dwCapBuffer.Caps.BufferBytes - 1;
            bpn2.EventNotifyHandle = _resetEvent.SafeWaitHandle.DangerousGetHandle();
            _notify.SetNotificationPositions(new BufferPositionNotify[] { bpn1, bpn2 });
        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            if (this.checkBox1.Checked == true)
            {
                int offset = 0;
                Thread _dwCaptureThread = new Thread((ThreadStart)delegate
                {
                    _dwCapBuffer.Start(true);

                    while (this.checkBox1.Checked == true)
                    {
                        _resetEvent.WaitOne();
                        _dwCapBuffer.Read(offset, typeof(short), LockFlag.None, _dwOutputBufferSize);
                        offset = (offset + _dwOutputBufferSize) % _dwCaptureBufferSize;
                    }
                    _dwCapBuffer.Stop();
                });
                _dwCaptureThread.Start();
            }
        }
    }
}

Oh and the reason for using DirectSound instead of Xaudio is for backward compatability for XP systems.