In addition, Zone Labs ZoneAlarm is another popular product that does a good job of securing a desktop (including being free for individual and not-for-profit charitable entity use, excluding governmental entities and educational institutions). Cisco also makes a product known as the Cisco Security Agent that integrates with their intrusion detection solutions which provide an effective desktop security solution.
At the end of the day, all of these product do many of the same things, and it becomes a question of which solution is best for your environment. If you have implemented and like BlackICE PC Protection, I think it sounds like a good solution for you.
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