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Coccobill is right, but I would still suggest a basic home router. It'll work out of the box, but you'll want to set it up, change admin password, etc.
Nothing will make you absolutely untouchable, but a router provides another layer that potential attackers would have to get through, and any unknown holes in your system won't be directly accessible from the outside.
None of this does any good though if you visit the wrong website (No Script for firefox is awesome, but like most security type stuff can be annoying) or run the wrong program, or do something even dumber like give out a password.
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