I only use one computer, a desktop, and I'm the only person that uses it. Yesterday, I experienced the "Homegroup" icon issue, where the icon suddenly appears in the list of shortcut icons, despite the fact that I've never done anything with it. I did some quick online research, and it seemed harmless. But, in the process of getting rid of it, I came across certain sharing/networking-related menus. Since I'd never done anything with those functions, they were still set on their defaults. They were set to share with any "approved" computers that were networked to mine. I decided to switch those options off, just to be safe.
Later, when I was logging out of my computer (prior to shutting it off), I noticed a new profile listed under mine. It simply said "Guest". I got paranoid, googled, and switched the guest account off. But it's still listed under my profile. Now, I had no idea that this built-in "guest account" function even existed. Is it possible that, when I was shutting off the sharing-related options, that "woke up" the guest account for the first time, causing it to be listed? Or is it something that I need to be worried about?
For the record, both of my normal profiles have administrative access, but I wasn't able to use the "local users and groups" function to investigate this other profile. That option wasn't listed. I'm not sure if it's because I only have the one computer, and there aren't any other users/groups to list, or if it's because I don't have the Pro version of Windows 8.
Any help would be greatly appreciated.