Changed to INTEL based CPU computer with INTEL PRO NIC.
Applied latest update for tech preview.
Now Networking is OK except FROM a LINUX server to W10 (W10 TO Linux is OK i.e W10 can access SAMBA shares).
A Windows 8.1 VM running on the Linux server under VMWARE can also access the W10 VM and the W10 HOST.
(W10 VM under HYPER-V on W10 HOST).
That's IT for tonight -- now some BEER etc.