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Also, what firewall would be a good one to stop hackers?
Onto the firewall question now. Well, I've heard many great things about ZoneAlarm that I needed to get it myself, which I did about one week ago and find it really great. It blocks basically everything unless you tell it not to block it. Everything it blocks, it comes up with a pop-up msg telling you what has been blocked and the originating IP address (clicking 'more info' goes to their website with more details on what has happened).