i came across something very interesting earlier. i found that a secondary account that was password protected had been created on my machine without my knowing. i deleted it meanwhile. but that's not the issue. i want my account to be the only account on here. i want to stop people from creating new accounts without my knowing. because for all i know, i might have had someone hacking into my computer. does anyone have any clue how to disable the creation of new accounts, either guest or other types?