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uses
  ShellApi;

procedure AddIcon(ANode: TTreeNode; AImageList: TImageList; const AFileName: string);
var
 FileInfo: SHFILEINFO;
 Icon: TIcon;
begin
  //Get The DisplayName
  SHGetFileInfo(PChar(AFileName), 0, FileInfo,
    SizeOf(FileInfo), SHGFI_DISPLAYNAME);
  ANode.Text := FileInfo.szDisplayName;
  //Get The Icon That Represents The File
  SHGetFileInfo(PChar(AFileName), 0, FileInfo,
    SizeOf(FileInfo), SHGFI_ICON or SHGFI_SMALLICON);
  // Create a temporary TIcon
  Icon := TIcon.Create;
  icon.Handle := FileInfo.hIcon;
  ANode.ImageIndex := AImageList.AddIcon(Icon);
  Icon.Free;
  // Destroy the Icon
  DestroyIcon(FileInfo.hIcon);
end;

procedure GetDirectories(Tree: TTreeView; Directory: string; Item: TTreeNode; IncludeFiles: Boolean);
var
  SearchRec: TSearchRec; 
  ItemTemp: TTreeNode;
begin
  if Directory[Length(Directory)] <> '\' then Directory := Directory + '\';
  if FindFirst(Directory + '*.*', faDirectory, SearchRec) = 0 then 
  begin
    repeat
      if (SearchRec.Attr and faDirectory = faDirectory) and (SearchRec.Name[1] <> '.') then 
      begin
        if (SearchRec.Attr and faDirectory > 0) then
        begin
          Item := Tree.Items.AddChild(Item, SearchRec.Name);
          AddIcon(Item, Form1.ImageList1, Directory + SearchRec.Name);
        end;
        ItemTemp := Item.Parent;
        GetDirectories(Tree, Directory + SearchRec.Name, Item, IncludeFiles);
        Item := ItemTemp; 
      end
      else if IncludeFiles then
        if SearchRec.Name[1] <> '.' then
        begin
          ItemTemp := Tree.Items.AddChild(Item, SearchRec.Name);
          AddIcon(ItemTemp, Form1.ImageList1, Directory  + SearchRec.Name);
        end;
    until FindNext(SearchRec) <> 0;
    FindClose(SearchRec);
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  Node: TTreeNode;
  Path: string;
  Dir: string;
begin
  Dir := 'C:\WINDOWS\SYSTEM32\DRIVERS\';
  Screen.Cursor := crHourGlass;
  TreeView1.Images := ImageList1;
  TreeView1.Items.BeginUpdate;
  try
    TreeView1.Items.Clear;
    GetDirectories(TreeView1, Dir, nil, True);
  finally
    Screen.Cursor := crDefault;
    TreeView1.Items.EndUpdate;
  end;
end;