code: def _GetKeyFromRegistry(self):
      
      if not self._registry:
        return
  
      try:
        self._registry_key = self._registry.GetKeyByPath(self._key_path)
      except RuntimeError:
        pass
  
      if not self._registry_key:
        return
  
      for sub_registry_key in self._registry_key.GetSubkeys():
        self.AddSubkey(sub_registry_key)
  
      if self._key_path == 'HKEY_LOCAL_MACHINE\\System':
        sub_registry_key = VirtualWinRegistryKey(
            'CurrentControlSet', registry=self._registry)
        self.AddSubkey(sub_registry_key)
  
      self._registry = None
docs: Determines the key from the Windows Registry.