public void StartScan()
{
//enable and disable menu items
administratorModeToolStripMenuItem.Enabled = false;
startToolStripMenuItem.Enabled = false;
pauseToolStripMenuItem.Enabled = true;
scanModeToolStripMenuItem.Enabled = false;
//Start the background worker for traversing files.
fileTraversalWorker.RunWorkerAsync();
//set the start time as right now
startTime = DateTime.Now;
//update the Start time: label
lblStartTime.Text = startTime.ToString("hh:mm:ss");
elapsedTimer.Start();
}