Windows 7: Friend's computer cannot connect to my network

I've got a friend visiting and we are unable to get their computer online at my house. My 4 computers connect fine to my router and internet. When this computer connects wirelessly, the connection to the router is successful, but then Windows says Access: Local Only and there is no internet.

When I try plugging in an ethernet cable to the router, Network Connections sees the cable is connected, but does not get online.

ipconfig shows the computer connected to the gateway but if I try to ping the gateway ip address it times out.
I am able to ping 127.0.0.1 and localhost with no problem.

I don't know if this makes any difference at all, but my friend's internet at home is CenturyLink, while I have Cox cable.

The really odd part is that we can see a neighbor's wireless signal and are able to connect to that with no problem. (Not sure if that ISP is Cox or Centurylink, my neighbor is out of town, but in ipconfig I see a DNS suffix that says Cox.)


Any ideas what I might try?

Thanks

How about posting an ipconfig/all from one of your working machines and one from your friend's.

On top of that, you might also want to compare the properties of the network adapters.

It is some setting in your router. More then likely a wireless setting of some type that is blocking his computer from going to the Net.

OK here's ipconfig screenshots from the problem computer when it is successfully connected to my neighbor's wireless, and then unsuccessfully connected to mine.

Thanks

Restart your wireless router. DONE.

Router restart done several times.

And here is my computer, connected to my network.

DHCP is not enabled on wireless!!

Set wired and wireless adapter properties to automatic!! network centre->change adapter settings. then right-click on adapter->properties->double click on tcp/ipv4

Do it for both wired and wireless. Off course you have to click OK multiple times to save it. Reboot afterwards

Most important is to set tcp/ip to "automatic get tcp/ip" address or something like that. A fixed ip-address is meant for servers. And wireless should never have a fixed ip address!!

And DON'T fill in DNS-servers. They are set automatically using dhcp (Dynamic Host Configuration Protocol)

See attachment (in Dutch)