I'm still having trouble with Cortana and the Search box. I used HP's maintenance program to Restore to an earlier time but no help. I still get a critical error when I left-click on the start button...

I can't get to "Settings." When I left-click on the Start button I get a critical error and Windows logs me off. I can right-click the Start button and it gives me a list of operations I can do, like...

I changed to Search Box to an Icon but now Cortana is gone and the Search Box won't search.