A firewall is a system-level software component that prevents
unauthorized access to your computer by others through a network
or Internet connection. Malware, or malicious software,
is a general term which includes viruses, worms, Trojan horses, rootkit, spyware
and key loggers and more. If you have a virus, you will want to check for this extra setting after the virus is removed
because it can be a way for the creators of the virus
to spy on you and determine every site you've been to and
collect your usernames passwords for each of these sites.