Some of our staff are receiving the following error message, which locks them out of their PC's for up to several hours.
"System Event Notification Service service
Please consult your System Administrator"
We have had this error in the past with a very few machines, but after the couple of hours or so, it let them in and the error didn't happen again.
I'm wondering if this is coming in on the heals of the MS patch for Meltdown & Spectre, or any MS update.