bool CodeProjectUtils::UpdateRegistry(CString strNetCfgInstanceId, LPCTSTR lpszMacID /*= NULL*/)
{
    bool bRet = false;
    HKEY hKey = NULL;
    if(RegOpenKeyEx(HKEY_LOCAL_MACHINE,
        _T("SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002bE10318}"),
        0,KEY_ALL_ACCESS,&hKey) == ERROR_SUCCESS)
    {
        DWORD dwIndex = 0;
        TCHAR Name[1024];
        DWORD cName = 1024;
        while( RegEnumKeyEx(hKey, dwIndex, Name, &cName,
            NULL, NULL, NULL, NULL) == ERROR_SUCCESS )
        {
            HKEY hSubKey = NULL;
            if(RegOpenKeyEx(hKey,Name,0,KEY_ALL_ACCESS,&hSubKey) == ERROR_SUCCESS)
            {
                BYTE Data[1204];
                DWORD cbData = 1024;
                if(RegQueryValueEx(hSubKey,_T("NetCfgInstanceId"),NULL,NULL,Data,&cbData) == ERROR_SUCCESS)
                {
                    if(_tcscmp((TCHAR*)Data,strNetCfgInstanceId) == 0)
                    {
                        if(lpszMacID == NULL)
                        {
                            //Delete the NetCfgInstanceId entry
                            LONG nErr = RegDeleteValue(hSubKey, _T("NetworkAddress"));
                            if( (nErr == ERROR_SUCCESS) || (nErr == ERROR_FILE_NOT_FOUND) )
                            {
                                bRet = true;
                            }
                        }
                        else
                        {
                            //Add the NetCfgInstanceId entry
                            if(RegSetValueEx(hSubKey,_T("NetworkAddress"),0,REG_SZ,(const BYTE*)lpszMacID,sizeof(TCHAR) * ((DWORD)_tcslen(lpszMacID) + 1)) == ERROR_SUCCESS)
                            {
                                bRet = true;
                            }
                        }
                    }
                }
                RegCloseKey(hSubKey);
            }
            cName = 1024;
            dwIndex++;
        }
        RegCloseKey(hKey);
    }
    return bRet;
}