After I upgraded to windows 10, I added a couple of new user accounts and deleted the only original windows 7 account. Now I can't delete the last remaining user account because it doesn't allow me to delete it while signed in. Question 1: how do I delete this remaining user account? Question 2: without a user account, how can I access the restore option to eliminate windows 10 and restore windows 7? Question 3: will I be forced to reinstall windows 7 from scratch, and if so, do I need to do anything before installing windows 7? Thank you!