wifi stopped working?

[shortdude123]

my brother's friend brought his laptop to my house, and for some reason when he tried to use it, it totally shut down my wireless network. Neither my computer nor my nintendo DS will detect my wireless network.

I've tried to reset it up.... when I go to set up a network, I click that the computer is connected directly to the net, then click Local Area Connection as what it is connected through (which it is, its connected through the ethernet port). However, it always tells me there was an error setting up the connection.... from what I gather, this should solve my problem with my network not working....but it says there's an error.

What do I do?

[shortdude123]

Also, the wireless connection on my computer, when enabled, gets about 6-8 packets, shows the IP, but just won't connect to google/aim/anything that requries internet.