I have Cox Cable. You have a stand alone modem. I would run down and buy a hardware router. I have simple needs and use the Linksys Network Everywhere NR041-wm Router. You can pick it up at Walmart for $40+-. If you want wireless or wired there are plenty of choices out there.
I don't like any thing AOL. IMHO they have some of the worst junkware on the market.
I have had a Cable modem since '97. All you need at the house is a modem, which you have a very good one. A router, which if you stick with a name brand should do fine. Each computer should run a software firewall. Zone alarm is good but I prefer SyGate.
Keep all your antivirus and anti spyware up to date and installed and your LAN should be safe.
AntivirusAVG Free Edition Antivirus(I personally use)
Avast Home Edition Antivirus FreewareAntispywareMicrosoft AntiSpyware BetaSpybotAdAware SE Personal EditionEwido Security Suite - 14 day trialA Squared FreeUtilitycCleanerEverest home(hardware information and diagnostics)
FirewallsSygate 5.4(I personally use)
Zone AlarmBest of all... they are free.