Why won't my pc lap top connect to the internet since i installed airport extreme

Installed a new airport extreme base station . The problem is my sons pc lap top that use to connect to the internet with my airport express wont connect to the internet with airport extreme . It Connects to the wireless network but not the internet . All my other computers 2 apple lap tops an imac desk top and a kindle fire connects to the internet . The three macs are running mountain lion 10.8.2  His pc is running windows xp .Any help would be appreciated .

Use System Preferences: Network: Show Network Port Configurations, there should be a setting where you can enable and disable individual Network Ports. Make sure that all the ports are disabled, except for Airport, the MacBook might be trying to connect to Ethernet via another port and not using Airport, even though it appears to be connected to linksys.
OS X 10.5 Leopard is organized a little different from OS X 10.4 Tiger, but you should be able to find the place in that System Preferences screen where you can display and change the Network Port Configurations.
You might possibly need to check the wireless router configuration to see how many IP addresses it can assign or if there are some other connection restrictions enabled on the router, for more info see the User Guide

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