Okay you must first install the cd that came with the usb wifi conection.
Then you must connect the wifi usb to the pc.
Then you must trun on your ds with a wifi game and go to wifi settings.
Then you must press "Nintendo wifi usb conecter".
Then test connect it so that it is good to use. If it says error something go to the nintendowifi.com and type in your error. If it tells you what is wrong go fix it.
Then if it doesn't solve it your stuffed. I advise you to get a router as it is easier and brakes through firewalls for the ds.
22/05/2008
Pokemon Pearl
Sydney, NSW