Hyperman3218 :
the problem is that cortana is not running in my task manager. And the start menu won't even work at all plus any search functions which annoys me. I was wondering about how I could turn cortana back on.
Did you try restarting?
If you are logged into a Microsoft account, you should be able to turn on cortana, if you live in an area that has cortana, simply by pressing Windows+S and then running the setup.
If restarting and the above doesn't work, you'll need to repair Windows.