I think this is the infamous Start Button and Task bar problem which I have and is still not solved after being on these forums for months. In my main user account the Task bar is not clickable (calendar, wi-fi, notices, etc.) and if I left click on the Start button I get the blue critical error message.
If you left click on the Start Button do you get an error message?
Right now I am working around this. I have set up another User account and made it an administrator account. I have transferred over my documents.
The next step when I have time will be to back up all documents and photos, etc. onto an external drive and then reset Windows 10 from scratch.