The newsletter asked if anyone received the upgrade through Windows Update. I did, and it was a forced upgrade. After a long time the processing stopped. I went to use the machine and found it wasn’t able to start Windows. After a lot of searching I found my Repair disk and got the system back. Then ran sfc /scannow to replace the corrupted files. I set Wireless to metered connection to prevent 1607 being installed again.
Microsoft should be severely taken to task on forcing major upgrades like this onto its unsuspecting customers. I’ve no idea what the problem was, but I’ll hang back from further updates until it gets its act together.