Problem sa Registry editorom

Code:

unit Primer;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs,Registry, StdCtrls;

type
  TForm1 = class(TForm)
    CheckBox1: TCheckBox;
    Label1: TLabel;
    Button1: TButton;
    Label2: TLabel;
    Label3: TLabel;
    procedure CheckBox1Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.CheckBox1Click(Sender: TObject);
var DelphiReg: TRegistry;
begin
if CheckBox1.Checked=true then
begin
    DelphiReg := TRegistry.Create;
    DelphiReg.RootKey := HKEY_CURRENT_USER;
    if DelphiReg.OpenKey('Software\Microsoft\Windows\CurrentVersion\Policies\System', True) then 
    DelphiReg.WriteInteger('DisableRegistryTools', 1);
    DelphiReg.CloseKey;
    CheckBox1.Caption:='Odselektuj da odblokiras editovanje registara!';
   end
  else
   begin
    DelphiReg := TRegistry.Create;
    DelphiReg.RootKey := HKEY_CURRENT_USER;
    if DelphiReg.OpenKey('Software\Microsoft\Windows\CurrentVersion\Policies\System', False) then 
    DelphiReg.DeleteValue('DisableRegistryTools');
    DelphiReg.CloseKey;
    CheckBox1.Caption:='Klikni da blokiras editovanje registara!';
   end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
Close;
end;

end.