Windows Services - Is there any code that cannot run in a service?

At startup, I need to check the status of a variable on my systems. First I tried using task scheduler to launch the code at boot, but it didn't work, so I am now looking into just writing a windows service. The idea is, I launch a dos based utility to check the stauts of the variable (I cannot check it directly it is proprietary), storing the status in a registry key. After the utility completes, I read the key. If the status is correct, I want to check the time. If the time is within a certain timeframe, it should launch a seperate program. The service seems to start ok, but as soon as it goes to check the time, it stops working.

Code Below:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.ServiceProcess;
using System.Text;
using Impersonationator;
using System.Management;
using Microsoft.Win32;

namespace CheckThawState
{
public partial class CheckThawState : ServiceBase
{
public CheckThawState()
{
InitializeComponent();
}

protected override void OnStart(string[] args)
{
SetfrzStateKey();//checks status, sets key
RegistryKey myKey = Registry.LocalMachine.OpenSubKey("Software\\Educational Technology"
+ "\\LaunchPad", true);
String state = myKey.GetValue("frzstate").ToString();
#region Thawed/Frozen Check
if (state == "thawed")
{
Boolean TimeCheck = ChkTime();
if (TimeCheck == true)
{
Console.Beep();//This never happens. The code never gets here.
StartLaunchpad();
}
else
{
return;
}
}
else if (state == "frozen")
{
return;
}
else return;
#endregion
}//end onStart method

//=============================================================

static bool ChkTime()
{
DateTime Now = DateTime.Now;
DateTime Today = DateTime.Today;
//if current time is after 3, but before 4, run updates
if (DateTime.Compare(Now, Today.AddHours(3)) > 0 && DateTime.Compare(Now, Today.AddHours(4)) < 0)
{
return true;
}
else return false;
}//end chktime

//=======================================================

static void StartLaunchpad()
{
using (new Impersonator("Administrator", Environment.MachineName, "raster2919"))
{

ManagementClass processClass = new ManagementClass("Win32_Process");
object[] methodArgs = { "c:\\slu_refresh\\lpupdater.exe /info", "c:\\slu_refresh\\", null, 0 };
object result = processClass.InvokeMethod("Create", methodArgs);
}
}//end startlaunchpad method

//==========================================================

static void SetfrzStateKey()
{
using (new Impersonator("Administrator", Environment.MachineName, "raster2919"))
{
ManagementClass processClass = new ManagementClass("Win32_Process");
object[] methodArgs = { "c:\\slu_refresh\\dfc.bat", "c:\\slu_refresh\\", null, 0 };
object result = processClass.InvokeMethod("Create", methodArgs);
ManagementObjectSearcher myQuery = new ManagementObjectSearcher("SELECT * FROM Win32_Process WHERE ProcessID = "
+ methodArgs[3]);
ManagementObjectCollection myCollection = myQuery.Get();
while (myCollection.Count > 0)
{
//While the batch file is running, wait
myCollection = myQuery.Get();
}
}//end Impersonation
}//end setrzstatekey

//==============================================================

protected override void OnStop()
{
// TODO: Add code here to perform any tear-down necessary to stop your service.
}
protected override void OnContinue()
{
base.OnContinue();
Stop();
}
protected override void OnCustomCommand(int command)
{
base.OnCustomCommand(command);
Stop();
}
}//end partial class
}//end namespace