FileSystemWatcher does not trigger from within a Service

Hi,
I have an service application that uses the FileSystemWatcher in C#
However, the events are not triggered when files are deleted, copied, added etc in the folder tree being monitored. Any ideas? the following is my code:

        protected override void OnStart(string[] args)
        {
            //System.Windows.Forms.MessageBox.Show("OnStart");
            #region 1. Add entry to Log with time and date of start
            AddLog("IN", "Vigilante Service Started");
            #endregion
            #region 2. Start the file monitoring service

            try
            {
                string folder =@"K:\test";
                AddLog("IN", "Watching folder " + folder);
                //Set the path that you want to watch.
                this.fileSystemWatcher.Path = folder;

                //Set the filter expression.
                this.fileSystemWatcher.Filter = "*.*";

                //Set monitoring for sub directories as well
                this.fileSystemWatcher.IncludeSubdirectories = true;

                //Add event handler for the Created event
                this.fileSystemWatcher.Created +=
                    new System.IO.FileSystemEventHandler(this.fileSystemWatcher_Created);

                this.fileSystemWatcher.Changed +=
                    new System.IO.FileSystemEventHandler(this.fileSystemWatcher_Changed);

                this.fileSystemWatcher.Deleted +=
                    new System.IO.FileSystemEventHandler(this.fileSystemWatcher_Deleted);

                this.fileSystemWatcher.NotifyFilter =
                    NotifyFilters.Security
                    | NotifyFilters.LastWrite
                    | NotifyFilters.LastAccess
                    | NotifyFilters.CreationTime
                    | NotifyFilters.FileName
                    | NotifyFilters.Size ;

                this.fileSystemWatcher.EnableRaisingEvents = true;
                AddLog("IN", "EnableRaisingEvents = " + this.fileSystemWatcher.EnableRaisingEvents);
            }
            catch (Exception e)
            {
                AddLog("ER", "Exception in OnStart Service " + e.Message  );
            }
            #endregion
        }

        private void fileSystemWatcher_Changed(object sender, FileSystemEventArgs e)
        {
            AddLog("IN", "File Changed: " + e.Name);
        }
        private void fileSystemWatcher_Created(object sender, FileSystemEventArgs e)
        {
            AddLog("IN", "File Created: " + e.Name);
        }
        private void fileSystemWatcher_Deleted(object sender, FileSystemEventArgs e)
        {
            AddLog("IN", "File Deleted: " + e.Name);
        }

The logs show that the service starts and the EnableRaisingEvents is set to true.
Thanks for any help.
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