How Can I Call Any Application(E.G. Notepad.Exe) In Windows Service?

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.NET2.0

C#

Windows

.NET

i create a window service which call notepad.exe after each 1 hour.
i write code:

protected override void OnStart(string[] args)
{
    timer1 = new Timer();
    timer1.Elapsed += new ElapsedEventHandler(timer1_Elapsed);
    timer1.Interval = 60000;
    timer1.Enabled = true;           
}
void timer1_Elapsed(object sender, ElapsedEventArgs e)
{
    EventLog.WriteEntry("notepad call start");
    Process.Start("notepad.exe");
    EventLog.WriteEntry("notepad is called");
}

after 1 hour eventviewer show "notepad call start" & "notepad is called"
but notepad is not open.how can i solve it.