.Net windows services

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Windows

service

I am unable display the message box in the fallowing windows service .
can any body help me to overcome this

public partial class Service1 : ServiceBase
{
public Service1()
{
InitializeComponent();
}

protected override void OnStart(string[] args)
{
timer1.Enabled = true;
}

protected override void OnStop()
{
timer1.Enabled = false;
}

private void timer1_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
Process[] p = Process.GetProcesses();
for (int i=0;i<p.length;i++)>
{
if (p[i].ProcessName.ToUpper() == "WMPLAYER")
{
p[i].Kill();
System.Windows.Forms.MessageBox.Show("your not authorized to open mediaplayer");


break;
}
}
}
}