Rootkit activity???

[Corrine]

The 'Guest' account allows anonymous access to the computer.  Having it disabled when not in use will prevent unauthorized use of services that may have inadvertently been left open.   

[winchester73]

Since the guest account allows a user to log on to a network, browse the Internet, and shut down the computer, you should turn off the guest account when it isn't being used.  By default, the guest account is not password protected, and anyone with physical access to your PC can use the machine by selecting to use the guest account (if it is turned on), though with limited privileges. The ideal security scenario is to have the guest account turned off when you don't need it, thereby preventing people without an account on your computer from logging in and using it.

See this nice tutorial: http://www.7tutorials.com/simple-questions-what-guest-account-how-turn-it

[DR M]

Corrine, this is an icon of how I see the forum after the restart. Is it ... correct?

Do you remember those "strange icons" that appeared suddenly on the top of the forum in my computer??
Well, today I realized that the icon beside the section Users online is the same.

Just this. It was a kind of discovery for me!   :mitch: