I Received Cumulative update WS10version 1607 for x64 systems KB3176929 and have now lost Cortana. With No way to switch it back on. Right clicking on the task bar does not give the option. Clicking on the search button gives a message about typing and
accessing apps and net. This does work but I would rather have Cortana back. Its not working on Edge either. I ran system restore which brought back Cortana but Then the Update Killed it again. (OS 14393.10 build Windows Insider)