I turned on my W10 today and got faced with a warning message on windows, saying;
"Critical Error - Start Menu and Cortana aren't working. We'll fix it next time you sign in"
There is a sign out now button in the message too. This however doesn't fix the problem.
I'm trying to figure out how to fix this. It seems to be a happening to a lot of people using W10. There are lots of youtube videos on fixing it too. Apparently my girlfriend gets this issue every other day too.
PS: I just fixed it by following the first step of this video:
https://www.youtube.com/watch?v=HUJ0jhsYf10Any ideas as to why this error occurs?