Glass Effect using dwmapi.dll in windows xp on C#?

Hii i am writing a code to make the glass effect on windows form. Well the code works fine on vista but my target is on windows xp. I have copyed all the dll’s that are reqired and when i debug i am getting an error "DLL NOT FOUND EXCEPTION UNHANDILED".
Here is the code that i am using:-
—————————————————————————————————————————–
This is the class where i import dwmapi dll.
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace welcome_page
{
class VistaGlassEffect
{
internal class VistaApi
{
[DllImport("dwmapi.dll")]
internal static extern void DwmExtendFrameIntoClientArea(System.IntPtr hWnd, ref Margins pMargins);

[DllImport("dwmapi.dll")]
internal static extern void DwmIsCompositionEnabled(ref bool isEnabled);

internal struct Margins
{
public int Left, Right, Top, Bottom;
}

// consts for wndproc
internal const int WM_NCHITTEST = 0×84;
internal const int HTCLIENT = 1;
internal const int HTCAPTION = 2;
}
}
}
—————————————————————————————————————————–
This the form where i call this class "VistaGlassEffect"

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Microsoft.DirectX.AudioVideoPlayback;
using System.Diagnostics;
using System.Drawing.Drawing2D;

namespace welcome_page
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
this.FitGlass();
}
Video video;
private welcome_page.VistaGlassEffect.VistaApi.Margins marg;
private Rectangle topRect = Rectangle.Empty;
private Rectangle botRect = Rectangle.Empty;
private Rectangle lefRect = Rectangle.Empty;
private Rectangle rigRect = Rectangle.Empty;

private void FitGlass()
{
// If DWM is not enabled then get out
if (!this.IsGlassEnabled())
{
return;

}

// Set the Margins to their default values
marg.Top = 600; // extend from the top
marg.Left = 400; // not used in this sample but could be
marg.Right = 200; // not used in this sample but could be
marg.Bottom = 860;// not used in this sample but could be

this.Paint += new PaintEventHandler(this.Form1_Paint);

// call the function that gives us glass,
// passing a reference to our inset Margins
welcome_page.VistaGlassEffect.VistaApi.DwmExtendFrameIntoClientArea(this.Handle, ref marg);
}

private void apply()
{
this.Paint -= new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
this.RecreateHandle(); //needed if changing on the fly
this.FitGlass();

}

private bool IsGlassEnabled()
{
//if (Environment.OSVersion.Version.Major < 6)
//{
// Debug.WriteLine("How about trying this on Vista?");
// return false;
//}

//Check if DWM is enabled
bool isGlassSupported = false;
——welcome_page.VistaGlassEffect.VistaApi.DwmIsCompositionEnabled(ref isGlassSupported);—Here Error OCCURS.
return isGlassSupported;
}

// Alpha-blending Paint after the glass extension
// this seems better than the winforms transparency approach because here we can click on the glass!
private void Form1_Paint(object sender, PaintEventArgs e)
{
// black brush for Alpha transparency
SolidBrush blackBrush = new SolidBrush(Color.Black);

Graphics g = e.Graphics;

if (this.IsGlassEnabled())
{
// setup the rectangles
topRect = new Rectangle(0, 0, this.ClientSize.Width, marg.Top);
lefRect = new Rectangle(0, 0, marg.Left, this.ClientSize.Height);
rigRect = new Rectangle(this.ClientSize.Width - marg.Right, 0, marg.Right, this.ClientSize.Height);
botRect = new Rectangle(0, this.ClientSize.Height - marg.Bottom, this.ClientSize.Width, marg.Bottom);
// Fill Rectangles
g.FillRectangle(blackBrush, topRect);
g.FillRectangle(blackBrush, lefRect);
g.FillRectangle(blackBrush, rigRect);
g.FillRectangle(blackBrush, botRect);
}

blackBrush.Dispose();
}

protected override void WndProc(ref Message m)
{
base.WndProc(ref m);

if (m.Msg == welcome_page.VistaGlassEffect.VistaApi.WM_NCHITTEST // if this is a click
&& m.Result.ToInt32() == welcome_page.VistaGlassEffect.VistaApi.HTCLIENT // …and it is on the client
&& this.IsOnGlass(m.LParam.ToInt32())) // …and specifically in the glass area
{
m.Result = new IntPtr(welcome_page.VistaGlassEffect.VistaApi.HTCAPTION); // lie and say they clicked on the title bar
}
}

private bool IsOnGlass(int lParam)
{
// sanity check
if (!this.IsGlassEnabled())
{
return false;
}

// get screen coordinates
int x = (lParam << 16) >> 16; // lo order word
int y = lParam >> 16; // hi order word

// translate screen coordinates to client area
Point p = this.PointToClient(new Point(x, y));

// work out if point clicked is on glass
if (topRect.Contains(p) || lefRect.Contains(p) || rigRect.Co

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