So Installed Windows early this morning and once I was able to sign on onto my personal account.

I got a pop up saying Critical Error Start Menu and Cortana arent working.

Well venture to fix it the next time you sign in.

Windows 10 critical error

I read online to try a different account.

Another user also shared: Upgraded my system yesterday and it was working well until an hour ago.

I decided to restart my system and after that, the problem occurred to me as well.

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I need it to be fixed as soon as possible.

Some users even attempted to go back to their older OS to address the issue but to no avail.

Hefound that oncehe uninstalled the Avast anti-virus software from his Windows 10 PC, the computer worked normally.

source: www.techworm.net