Shelling from a "Window Service"

Hello,
I wrote a "Windows Service" that has a timer in it.  At the top of every hour I want it to shell out to a .exe file which will process some information.  The service seems to be working fine but when it hits the shell command it doesn't seem to do anything.  The service was written using "VB 2005".  The .exe file I am wanting to shell out to has a parameter to pass to it.  I can get to work using a windows app just not the service.  Here is what I am using to shell.

Shell("D:\program files\SearchEngineStudio\SearchEngineStudio.exe " + Chr(34) + "c:\Search Engine\Policy Manual.ses" + Chr(34) + " /d /r", AppWinStyle.NormalFocus)

Any help would be greatly appreciated.  

Private Sub OnTimedEvent(ByVal state As Object)
 
        Dim Hold_Date As Date
 
        oTimer.Dispose()
 
        ' Check if the the Event Log Exists 
        If Not MyLog.SourceExists("SES_Service") Then
            MyLog.CreateEventSource("SES_Service", "SES_Service Log") ' Create Log 
        End If
        MyLog.Source = "SES_Service"
 
        Hold_Date = Now
 
        If DatePart(DateInterval.Hour, Hold_Date) <> int_Previous_Hour Then
            int_Previous_Hour = DatePart(DateInterval.Hour, Hold_Date)
            Shell("D:\program files\SearchEngineStudio\SearchEngineStudio.exe " + Chr(34) + "c:\Search Engine\Policy Manual.ses" + Chr(34) + " /d /r", AppWinStyle.NormalFocus)
            ' Write to the Log 
            MyLog.WriteEntry("SES_Service Log", "Search Engine Indexed " & CStr(TimeOfDay), EventLogEntryType.Information)
        End If
 
        Dim oCallback As New TimerCallback(AddressOf OnTimedEvent)
        oTimer = New System.Threading.Timer(oCallback, Nothing, 10000, 10000)
 
    End Sub

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