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Securing shared wireless network with infected PC

I somewhat doubt your access point has a way to bridge 802.11a and 802.11g networks separately through some sort of partitioning mechanism (separate VLANs, for example). Most home devices don't have that level of functionality.

Since the AP will more than likely bridge everyone on a common collision domain, the easiest way to reduce your risk exposure is by using a software firewall on each of your reformatted stations.

Or you can be a bit cruel and just change the access key to the Wi-Fi network (assuming you're running WPA or WPA2 via pre-shared key mechanism) and tell that owner of the third machine that until s/he sterilizes the machine with rubbing alcohol, soap, and various anti-malware software, he stays off your network. It's a bit tricky if he has physical access to your router and a spare Ethernet cable.

Thanks.

i dont know how complex your network is but you can jail or deny internet access to the infected pc from the rest of network.

reply to cardlady