Не могу вносить изменения в реестр

//---------------------------------------------------------------------------

#include <vcl.h>
#include <registry.hpp>
#pragma hdrstop
#include "Unit1.h"

//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
TRegistry *reg = new TRegistry(KEY_ALL_ACCESS);
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------


//"http://sources.ru/builder/faq/index.html8"


void __fastcall TForm1::Button1Click(TObject *Sender)
{
reg->RootKey = HKEY_LOCAL_MACHINE;
reg->OpenKey("HKEY_LOCAL_MACHINE\\SYSTEM\\AAA",true);
reg->WriteString("BBB",2);
}