All good now since clean install of build 10162. As a matter of fact. Build 10162 is the best so far. All issues I have been raising all been resolved.
Running W10 on an original Dell Vostro 1000 (2002), Athlon 64 X2 Dual Core 1.7Ghz, 4 GB (using 2.94 GB) RAM, ATI Radeon XPress 1100 64