What do you get via
http://proof.ovh.net/
install
inSSIDer on your wireless device/laptop. let it search for all networks within reach then look at the channel number each uses and set yours to one that isn't in use. They will range from 1-13.
which wireless chip do you have? expand network adapters
Vista/7 - Start > in the search box type in or copy/paste devmgmt.msc
XP - Start > Run > devmgmt.msc