Have a windows service that listens to a msmq. In the OnStart method is have this

protected override void OnStart(string[] args)
{
    try
    {
        _queue = new MessageQueue(_qPath);//this part works as i had logging before and afer this call

        //Add MSMQ Event
        _queue.ReceiveCompleted += new ReceiveCompletedEventHandler(queue_ReceiveCompleted);//this part works as i had logging before and afer this call

        _queue.BeginReceive();//This is where it is failing - get a null reference exception
    }
    catch(Exception ex)
    {
        EventLogger.LogEvent(EventSource, EventLogType, "OnStart" + _lineFeed +
             ex.InnerException.ToString() + _lineFeed + ex.Message.ToString());
    }
}

where

private MessageQueue _queue = null;

This works on my machine but when deployed to a windows 2003 server and running as Network service account, it fails

Exception recvd:

Service cannot be started. System.NullReferenceException: Object reference not set to an instance of an object.
at MYService.Service.OnStart(String[] args)
at System.ServiceProcess.ServiceBase.ServiceQueuedMainCallback(Object state)

Solved: Turned out that the Q that i set up, I had to explicitly add Network Service account to it under security tab