The problem with relying on the XP firewall or a router is that if you ever do get infected by something (no program is perfect so you can still get infected) it won't stop that infection from connecting to the internet. They'll stop incoming threats but will still allow your computer to broadcast out.
If you want an all-in-one program; The 3 best ones, imo, are BitDefender, TrendMicro and Kaspersky.
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