can't run other Application in Windows Service

[erickwidya]

i created new windows service with timer inside it for scheduler purpose and it can run successfully but it can't run other application (ex: notepad) when the timer elapsed..

i can see the process running in Task Manager but the notepad windows is not open

i used this code in timer_elapsed event

AppLauncher oAppLauncher = new AppLauncher(@"C:\Windows\Regedit.exe");
            new Thread(new ThreadStart(oAppLauncher.StartProcess)).Start();

where applauncher is a Class

 class AppLauncher
    {
        string myAppPath = string.Empty;

        public AppLauncher(string _sPath)
        {
            myAppPath = _sPath;
        }

        public void StartProcess()
        {
            ProcessStartInfo oProcessStartInfo = new ProcessStartInfo(myAppPath);
            oProcessStartInfo.WindowStyle = ProcessWindowStyle.Maximized;

            Process oProcess = Process.Start(oProcessStartInfo);
        }

    }

when i build windows App i can see Notepad open using the same code

any insight?

thanks