Returning Processes returns both process and services

[scrypt3r]

Hello

I was Looking back at Some apps i made a long time ago in xp (ive upgraded to vista now) but one is catching my eye, this app is supposed to return running processes but returns services aswell, is there any way to make it show only Processes and not services?
the code is only

Process[] prc = Process.GetProcesses();
            while (true)
            {
                foreach (Process p in p)
                {
                    listBox1.Items.Add(p.ProcessName.ToString());
                }
                Thread.Sleep(5000);
                listBox1.Items.Clear();
            }