What 8.1 screen is it appearing on? It isn't just an entry in File Explorer under the Network Heading is it?
Your screenprint shows an unknown device in the table on the broadband setup page. Can you account for that entry? Not sure whether you were indicating that it did or it didn't relate to the Sony entry.
Windows may have tried to install some phone, or even some other device, at some point in the past via upnp and just be showing you what it identified as a network device.
EDITED: 26 Nov 2014 17:19 by WILLIAMA