Get HID information local machine

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C#

.NET

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Management;

namespace WindowsFormsApplication4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();


        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                ManagementObjectSearcher MOSearcher = new ManagementObjectSearcher("root\\WMI", "SELECT * FROM MSSerial_PortName");

                foreach (ManagementObject MOject in MOSearcher.Get())
                {
                    listBox1.Items.Add(MOject["InstanceName"]);//MSSerial_PortName instance
                    listBox1.Items.Add(MOject["PortName"]);//MSSerial_PortName instance

                    //If the serial port's instance name contains USB it must be a USB to serial device
                    if (MOject["InstanceName"].ToString().Contains("USB"))
                    {
                        listBox1.Items.Add(MOject["PortName"] + " is a USB to Serial Adapter/Converter");
                    }
                }
            }
            catch (ManagementException me)
            {
                MessageBox.Show("An error occurred while querying for WMI data: " + me.Message);
            }
        }
    }
}

I'm having the folowing code. This works with windows xp. When i run it in windows 7 it doesn't. How is that possible? Error: not supported ??