Hi nanajana, sorry to hear of the problem with shutting down your computer and the message that keeps popping up.
As it started after installing some updates I think a good first step would be to use a System Restore Point created BEFORE the problems started. This will put your computer's settings back in time to what they were before the problem started.
Here's the information from Microsoft and I am setting out underneath the steps you can consider taking:
To restore your PC to an earlier point in time
Swipe in from the right edge of the screen, then tap Search.
(If you're using a mouse, point to the top-right corner of the screen, move the mouse pointer down, then click Search.)
Enter Control Panel in the search box, then tap or click Control Panel.
Enter Recovery in the Control Panel search box, then tap or click Recovery.
Tap or click Open System Restore, then follow the instructions.
Extracted from here:
http://windows.micro...efresh-reset-pc
There is no need for you to perform a reset or refresh at this time, so just use the System Restore Point and see if this does the trick for you.( however do make sure that the System Restore point you use id one dated definitely BEFORE the trouble started...
Post back and let us know how you get on
Regards
paws