Yeah, there must have been about 50 different fixes on offer, spread over a couple of forum pages going back to 2009, but the one that seemed to get the most votes was check adaptor for "client for MS networks" (lacking on mine, and apparently many other Win 7 installs). But I also did one more thing while I was at it: enable NetBIOS over TCP/IP. Rebooted and everything on the network was visible in my file browser, so I didn't bother with deleting the supposedly offending KB.
EDITED: 2 May 2018 13:20 by DSMITHHFX