Some versions of Windows, most notably XP (Before Service Pack 2) and earlier (2000, ME, NT, 98), do not have a built in firewall. Without this firewall, hackers can directly log into your system and/or use other tools to turn your machine into their own personal slave. This is a threat to your personal privacy and your identity if you bank or shop online.
Note: We only recommend downloading a Firewall on machines that do not already have one.
Multiple firewalls on the same machine may clash and cause other problems, up to and including not being able to access the net at all.
Luckily, you can download a Firewall using the link below.