Exptreelib : error HRESULT E_FAIL has been returned from a call to a COM component

<pre lang="C#">
if (CSI.DisplayName.Equals(CShItem.strMyComputer))
{
					dirList = CSI.GetDirectories();

// this line is throwing HRESULT E_FAIL exception
 }

CShItem chitem2 = new CShItem("::{20D04FE0-3AEA-1069-A2D8-08002B30309D}");
AfterNodeSelect("This PC", chitem2);
BackItemStack.Add("::{20D04FE0-3AEA-1069-A2D8-08002B30309D}");
ItemCount = BackItemStack.Count;
btnBack.Enabled = true;

try
          {
              ArrayList dirList = new ArrayList();
              ArrayList fileList = new ArrayList();
              int TotalItems = 0;
              LastSelectedCSI = CSI;

              if (CSI.DisplayName.Equals(CShItem.strMyComputer))
              {
                         dirList = CSI.GetDirectories();
              }
              else
              {
                  dirList = CSI.GetDirectories();
                  fileList = CSI.GetFiles();
              }
              Event1.WaitOne();
              TotalItems = dirList.Count + fileList.Count;
              if (TotalItems > 0)
              {
                  dirList.Sort();
                  fileList.Sort();
                  //pathName = "N:\VE\Job2011"
                  this.Text = pathName;

                  sbr1.Text = pathName;
                  ArrayList combList = new ArrayList(TotalItems);
                  combList.AddRange(dirList);
                  combList.AddRange(fileList);

                  //Build the ListViewItems & add to lv1
                  lv1.BeginUpdate();
                  lv1.Items.Clear();
                  lv1.Refresh();

                  foreach (CShItem item in combList)
                  {
                      ListViewItem lvi = new ListViewItem(item.DisplayName);
                      if ((item.IsDisk & item.IsFileSystem) == Convert.ToBoolean(0))
                      {
                          FileAttributes attr = (FileAttributes)Microsoft.VisualBasic.FileSystem.GetAttr(item.Path);
                          StringBuilder SB = new StringBuilder();
                          if ((attr & FileAttributes.System) == FileAttributes.System)
                          {
                              SB.Append("S");
                          }
                          if ((attr & FileAttributes.Hidden) == FileAttributes.Hidden)
                          {
                              SB.Append("H");
                          }
                          if ((attr & FileAttributes.ReadOnly) == FileAttributes.ReadOnly)
                          {
                              SB.Append("R");
                          }
                          if ((attr & FileAttributes.Archive) == FileAttributes.Archive)
                          {
                              SB.Append("A");
                          }
                          lvi.SubItems.Add(SB.ToString());
                      }
                      else
                      {
                          lvi.SubItems.Add("");
                      }
                      if ((item.IsDisk & item.IsFileSystem & !item.IsFolder) == Convert.ToBoolean(0))
                      {
                          if (item.Length > 1024)
                          {
                              lvi.SubItems.Add((item.Length / 1024.0).ToString("#,### KB"));
                          }
                          else
                          {
                              lvi.SubItems.Add(item.Length.ToString("##0 Bytes"));
                          }
                      }
                      else
                      {
                          lvi.SubItems.Add("");
                      }
                      lvi.SubItems.Add(item.TypeName);
                      if (item.IsDisk)
                      {
                          lvi.SubItems.Add("");
                      }
                      else
                      {
                          if (item.LastWriteTime == testTime) //"#1/1/0001 12:00:00 AM#" is empty
                          {
                              lvi.SubItems.Add("");
                          }
                          else
                          {
                              lvi.SubItems.Add(item.LastWriteTime.ToString());
                          }
                      }
                      //.ImageIndex = SystemImageListManager.GetIconIndex(item, False)
                      lvi.Tag = item;
                      lv1.Items.Add(lvi);
                  }
                  lv1.EndUpdate();
                  LoadLV1Images();
              }
              else
              {
                  lv1.Items.Clear();
                  sbr1.Text = pathName + " Has No Items";
              }

          }
          catch (Exception ex)
          {
              MessageBox.Show(ex.Message.ToString());
          }