Win 10 network discovery problems - need help

This only happens on a single Win 10 Pro machine, brand new out of the box, in a workgroup, that has 7 machines.

Installing software with the installation software on a machine running Server 2012 R2, via shared folder.  All updates are installed.  The installation shows a menu so you can browse to where the data is.  The data is on the server but the installation cannot browse to the server.  I don't know the protocol used to build the list of available machines.

There were no error messages

I finally added the server to the available DNS locations for the workstation adapter.  

Then I had a similar problem on the same machine to install an HP printer on the network, using the HP installation software.  This problem was finally solved by using windows to add the printer using a fixed IP address

AVG pro is used as the AV and Firewall on all machines
All machines are connected via ethernet
Network sharing is turned on
Network discovery is turned on
I've turned off the AVG firewall just to make sure, then turned it back on after it didn't improve anything
Flushed the DNS
Workgroup name is correct
It is in a Private network

I'm running out of ideas, need some help