Does Zone Alarm block hackers?

Does zone alarm work well in blocking hackers? I see someone trying to access via port 515 and other ports associated with known Trojans, Back Orifice etc. Why would they do this? What's the purpose? I just have a home CPR, no national secrets. Will this actually block such attempts? If not, what would you suggest?
Zone Alarm is a good personal firewall with application control, which helps block open and vulnerable ports on your system, protecting against intrusions and hostile attacks. Any personal computer online is a potential target for dangerous Internet threats like Trojan horse or malicious software. Hackers usually barrage these scans or access, looking for loose systems, which can be used for targeting other online systems. As a personal firewall, Zone alarm does its job pretty well. A fully licensed version is good for home PC users.
This was first published in December 2001

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