Okay. This is really making me mad. I have a D-Link adapter card for my computer, and a Linksys Router.
Sadly, my Latency (as seen from ingame) has been randomly spiking from 98 ms to 20000 ms (no joke) in less than 3 seconds. It then stays that way for at least 10 minutes. Then It comes back down for a minute.
Log into your Linksys router, just like when you set it up originally, and go to the wireless settings. You will be able to choose the channel. Change it to a different channel, but 6 and 11 are good channels to begin with.
The default IP for linksys routers is 192.168.1.1 -- so open your web browser and enter http://192.168.1.1/ and press enter and it should bring you to your router's configuration screen -- find the settings page and change the channel as Phil instructed -- This may help if there are others in your area using wireless routers as well or it might just be that you need a better network card for the laptop if the antennae signal strength is low or you might want to switch to a wired connection for gaming anyway since wireless will always be a bit slower\ less reliable than a wired connection.