Microsoft windows XP has its own built in Firewall that helps to protect the system from hackers,viruses and many other threats like that .It should be always on because it also keep an eye on critical security updates that are necessary for windows are antivirus.To turn it on in go to control panel and then select security center,click on Firewall option and turn it to on.It will also inform you that your antivirus is up to date are not.
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