Choosing the Best Windows XP Firewall - Windows Firewall Plus Trusted Antivirus Equals Protection
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If you are going to install anti-virus on your computer, it will scan and detect malicious programs installed. So if a Trojan (or even some spyware) is trying to execute (i.e. initiate a connection to a remote server), the real-time scanning of the anti-virus will try to detect it and block those programs.
The real-time scanning will analyze all running processes in your computer, which cannot be done by Windows Firewall. If the intent is malicious, or if it tries to run a program, an anti-virus will stop it and clean the infected file. This is why anti-virus software is very useful and should be installed in the computer -- to protect your installed, clean programs as well as your privacy.
An additional protection to the above diagram can be added to your computer by installing the latest browsers. These browsers fix security problems, and will show a warning if you have visited malware sites which have tried to install some programs into your computer.
Some users are still not educated on the topic of how dangerous it is to your computer's security to visit this type of site. Although a lot of browsers give you a warning, it is highly advisable to always turn on the firewall, use anti-virus software and keep away from those sites that display the dreaded malware signs (a red one in Firefox, for example).
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