Mac Address problem on Vista

CString CActivationManager::GetMACaddress(int indx)
{
	IP_ADAPTER_INFO AdapterInfo[16];       // Allocate information
	// for up to 16 NICs
	DWORD dwBufLen = sizeof(AdapterInfo);  // Save memory size of buffer
 
	DWORD dwStatus = GetAdaptersInfo(      // Call GetAdapterInfo
		AdapterInfo,                 // [out] buffer to receive data
		&dwBufLen);                  // [in] size of receive data buffer
 
	if (!dwStatus == ERROR_SUCCESS) // Verify return value is
		return _T("ERR");
 
	// valid, no buffer overflow
	PIP_ADAPTER_INFO pAdapterInfo = AdapterInfo; // Contains pointer to
	// current adapter info
	CString macAddressStr;
	int num = 0;
	do 
	{
		if  ( pAdapterInfo->Type == 6 )
		{
			macAddressStr.Format(_T("%02X-%02X-%02X-%02X-%02X-%02X"), 
				pAdapterInfo->Address[0], pAdapterInfo->Address[1], pAdapterInfo->Address[2], 
				pAdapterInfo->Address[3], pAdapterInfo->Address[4], pAdapterInfo->Address[5]);
 
			if ( pAdapterInfo->Address[1] == pAdapterInfo->Address[2] && 
				 pAdapterInfo->Address[1] == pAdapterInfo->Address[3] &&
				 pAdapterInfo->Address[1] == pAdapterInfo->Address[4] )
			{
				indx++;
			}
			else
			{
				if (num == indx)
					return macAddressStr;
			}
		}
		else
		{
			indx++;
		}
	
		pAdapterInfo = pAdapterInfo->Next;    // Progress through
		num++;
		// linked list
	}
	while(pAdapterInfo);                    // Terminate if last adapter
 
	return _T("");
}