If you want to create another local account without jumping through Microsoft (or domain) hoops, you can do that from the command prompt in administrator mode (right click and ‘run as administrator’).

net user new_username /add new_user_password

This will create a standard user. You can switch that to a local administrator in the user accounts desktop app (available via the control panel — or just type it in)

Speaking of ‘annoying things’, if you’re annoyed at the new UI (which I’d guess is proportionate to your loathing of Win8’s attempt to jam a tablet interface down everyone’s throat) check out Stardock’s Start10. I set everyone up with this when we moved from 7 to 10. So far, there’s a single desktop user who prefers the tablet-ey native W10 UI. Free trial, and, if you buy it, it’s just $5. If you’re coming from W7, I’m guessing you’ll like it, but it’s easily removed if you don’t.

Finally, if you are on a domain, check to see if your local Administrator account is active (look in the user accounts app). If it isn’t, think about turning it on. It turns out to be very handy if/when something goes wrong with your domain — and once there’s a problem, you can’t login to turn it on. Again, from the Admin command prompt, it’s:

net user administrator /active:yes new_admin_password

If you’ve forgotten the password to that account, you can use the above command to reset it.