run exe as system not working

I have the following application below that keeps a screen/computer from sleeping for a kiosk machine.  If I run this manually as myself, it works.  I wanted to run it as system and have it start when the kiosk auto-logs in on a reboot.  When I run it as system, I log in, I see it running, but the application is not working.  I can kill the task, restart it as myself, and then it works.  Any ideas?

Imports System.Runtime.InteropServices

Public Class Form1

    <DllImport("Kernel32.DLL", CharSet:=CharSet.Auto, SetLastError:=True)> _
    Private Shared Function SetThreadExecutionState(ByVal state As EXECUTION_STATE) As EXECUTION_STATE
    End Function


    ' API call to prevent sleep (until the application exits)
    Private Declare Function uses Lib "kernel32" (ByVal esflags As EXECUTION_STATE) As EXECUTION_STATE

    ' Define the API execution states
    Private Enum EXECUTION_STATE
        ' Stay in working state by resetting display idle timer
        ES_SYSTEM_REQUIRED = &H1
        ' Force display on by resetting system idle timer
        ES_DISPLAY_REQUIRED = &H2
        ' Force this state until next ES_CONTINUOUS call
        ' and one of the other flags are cleared
        ES_CONTINUOUS = &H80000000
    End Enum

    ' Prevents sleep as form loads
    Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        No_Sleep()
    End Sub

    ' Call API - force no sleep and no display turn off
    Private Function No_Sleep() As EXECUTION_STATE
        Return SetThreadExecutionState(EXECUTION_STATE.ES_SYSTEM_REQUIRED Or _
               EXECUTION_STATE.ES_CONTINUOUS Or EXECUTION_STATE.ES_DISPLAY_REQUIRED)
    End Function
End Class