You have not said whether you have run the requisite wizards on each PC; the first to run is the Network Setup Wizard, which must be run on every client, but is best done on any ethernet-connected PCs first. It can be run on wireless clients after you have browsed for your wireless network and established a connection via the WLAN icon in the Notification Area. Encryption should be left disabled at this stage. If after establishing the connection, no internet access is found over the wifi link, then you have missed one or more of three things: 1) The appropriate permissions should be configured in any software firewall. Said firewall should prompt you for a response to the network communication. 2) "Never dial a connection" must be selected in the Connections page of Internet Options in Control Panel. 3) The NSW must be run.