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If you get a hardware router (e.g. Linksys and SMC are two popular brands), they can act as firewalls too, and protect the PCs behind them from malevolent probes coming from the internet.
ZoneAlaram is a good program (the basic version's even free), but the trouble is you have to manually approve each program when it wants to have Internet access. A good security measure some might say, but it can be a right pain, especially if you play an online game or something that takes full screen - it'll mess it up!
I agree that hardware routers are much more secure. My router has a pretty solid firewall.
If you want to check out the stability of your firewall/computer etc., check out this site:
There is a popular free tester on there called 'Shields UP'. Run it, and then run the 'Probe my Ports' test - it'll tell you what's going on with regards to your ports - whether they're open, closed, or stealth.
It's very useful when testing out the security of your configuration. (You don't need a router or any firewall, it will work on virtually any PC).