"NDIS 1394 Net Adapter", "Client for Microsoft Networks" and "Sony i.LINK (1394) Adaptor" are displayed in the [Problem Devices] window when I click [System information] -> [Component] -> [Problem Devices]. Why is that so?
You may use your computer as it is.
This symptom seems to occur sometimes when a network component is not used (even though it has been installed) in the environment where some specific network components (such as a client for a network and a network adapter) co-exist.
When this symptom occurs, use (enable) the network component displayed in the window (e.g. make the LAN connection through i.LINK or Ethernet) and it will not appear in [Problem Devices] again.