Windoes 7 Firewall

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OK so I uninstalled the Online Armor free firewall I had cos my PC seemed very slow when using it...also I have an Asus N56U router via Ethernet and also using my Virgin Media Superhub in modem mode....question is do I actually need to have a 3rd party Firewall installed at all or do i just rely on the Windows firewall and my router ?

thanx

P.S four PCs in house ..but not networked to each other

 

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OK thanx for advice/help

 

[foster grant]

I too use commodo, v occassionally a pain but fine overall.

Yeah I've chosen to add it to my system ...seems a little more of a simpler UI too