Code:

uses
  ShellApi;

procedure RenameDir(DirFrom, DirTo: string);
var
  shellinfo: TSHFileOpStruct;
begin
  with shellinfo do
  begin
    Wnd    := 0;
    wFunc  := FO_RENAME;
    pFrom  := PChar(DirFrom);
    pTo    := PChar(DirTo);
    fFlags := FOF_FILESONLY or FOF_ALLOWUNDO or
              FOF_SILENT or FOF_NOCONFIRMATION;
  end;
  SHFileOperation(shellinfo);
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
  RenameDir('C:\Dir1', 'C:\Dir2');
end;

Code:


procedure TForm1.Button1Click(Sender: TObject);
begin
RenameFile('C:\Ime_Ovo_Foldera','C:\Se_Menja_U_Ime_Sto_Se_Napise_Ovde');  // :)
end;