Windows 10 Anninversary Update

I have two Dell xps 8700 pcs. I updated the one pc to the Windows 10 Anniversary Update. It seemed to go OK. Afterwards, I used the PC for about an hour. When I went to shut down, I was surprised to see there was already an update. (Why was I surprised?) I selected Update and Shutdown which I have done many times in the past. Then I updated the other pc. It seemed to go OK. I used the PC for about 2 hours. Next morning I used that same PC for about 3 hours. Then I tried to open Corel Painter 2017 and it got stuck. Tried it a second time and it got stuck. I thought what the heck. I just bought this program. Then I decided I should restart to see if that fixed the issue. When I restarted, I saw that Windows updates were being installed. I thought "I should have known." Every time programs start acting squirrelly, I find out that Microsoft has installed something that required a reboot but failed to tell me.
 
The system restarted several times, had the black screen with the spinning dots for a long while and then the cave picture came up. I clicked and got the login in screen. I started to enter my password. The screen froze after I entered one letter and after a few seconds, it restarted. Then the same thing happened again. And then again maybe 5 times and then it went to a black screen that said Starting Automatic Recovery. Then immediatedly it went to a pale blue screen that said that the following file
 
WRkrn.sys was either missing or corrupt and that I needed a disk or a systems administrator.
 
I wasn't sure if I had created a recovery disk or where it was if I had, so I ran to the other pc that I had Updated and shut down thinking I could create a recovery disk there. But when I turned it on, it went through the same gyrations and ended with the exact same failure.
 
I called Microsoft and they kept wanting me to start in safe mode, but neither system would. Finally they had me create an iso image. When I booted from that, it said that it appears I was in the middle of an update and that I should select YES to end this and continue with the update or select NO to install and keep my files but lose my apps. I did notice at the bottom of the screen that there was a recovery option so I went there. But none of the options I tried worked. Finally I restored both PCs using Macrium backups.
 
I didn't realize the WRkrn.sys might be a Webroot file until somebody on the Dell forum pointed it out. So what does this mean? Did Webroot cause the update to fail? Or did Microsoft fail to create files necessary to recover the PC if anything went wrong thus the file was missing.
 
And if Webroot needs to be shut down before an update is applied, how can I deal with this. Most of the time Microsoft doesn't even tell you they are installing updates. You don't find out until you shut down.
 
I opened the help thread that I have with Webroot and I asked about this, but I'm not sure if they got the message, as I didn't get the usual "We'll be in touch soon." I saw after I submitted that there was a button to ALLOW COOKIES. I didn't press it until after I submit the quesiton. Maybe that's why.