Time To Run Windows Update
Security updates available for all supported versions of Windows, IE, Edge, Flash…
Microsoft Security Bulletin Summary for March 2017
see also: Windows 10 and Windows Server 2016 update history
I would highly recommend watching Ask Woody to monitor the situation with these updates. Especially watch his MS-DEFCON board.
Flash
What would Patch Tuesday be without Adobe patching Flash?
APSB17-07 Security updates available for Adobe Flash Player
Download (for Firefox, Opera, Chromium, IE 10 and earlier)
Google Chrome
Chrome 57 was released 5 days ago. It contains the latest Flash version
All updates went smoothly on 8.1.