What About Windows Service Security?????????????????????

Hi Team;
Hi frinds Windows Service is background process it has no UI & all thing is taken care by OS.
i.e. all the security aspects also taken care by os.So i have one query Is there any custom security for windows security.
In ProjectInstaller.Designer.cs i saw
private void InitializeComponent()
        {
            this.serviceProcessInstaller1 = new System.ServiceProcess.ServiceProcessInstaller();
            this.serviceInstaller1 = new System.ServiceProcess.ServiceInstaller();
            //
            // serviceProcessInstaller1
            //
         & ...