Usually Windows updates when I turn the power off at night - it goes into update mode before it will shut off.
Today, March 30, it started an update when I turned it on. And it went on and on and on and on. Over 90 minutes of updating.
The last Windows 10 major update I can find was back on March 8. [KB3140768 (OS Build 10586.164)]
So what the heck was going on this morning? And that March 8 update was a few minor things. What can Windows possibly do in a mere update that require 90 minutes of computer time.
My computer is staggering like it just woke up from a coma, too. Screens going black, browser windows switching, odd internet errors. Opening Word was instantaneous. Today it took 20 seconds. Upgrading to Windows 10 went faster and smoother than this.