The part that confuses me is, you have a wireless network on the Internet, but you don't say which machines if any have wireless cards, or even if that is what you are attempting to make function.
I am going to make the following assumptions:
* You have a second PC running Linux that you wish to have access the Internet
* You have a primary system which is windows which is already attached to the net in some fashion.
* You have wireless access in your dwelling to some form of broadband.
Based upon these assumptions, I will in-turn, assume the following;
* Your primary workstation is on the internet wirelessly
* You do not have a wireless card for your Linux box and are looking for some means of getting that on the network.
If these assumptions are correct, then you have several options. Generally, wireless WAP devices come with physical ports for direct access -- YMMV, since I am unfamiliar with the Belkin model. If this is the case, you can simply plug your linux box's rj-45 connected ethernet cable into one of those ports and it should be good to go. If this is NOT the case, you have several choices; all involve spending money.
* Buy a (compatible) wireless card for your Linux box. Of course, when I say "compatible" I mean with the OS, not the WAP -- 802.11x is 802.11x.
* Buy a crossover cable and use the (assumed) ethernet port on your Windows box, to share your internet connection with the Linux box. NOTE: It must be a crossover, not a standard ethernet cable.
* Buy a switch or Cable/DSL router. Follow installation instructions.
If your situation is wildly different than I have gone through here, perhaps you may wish to re-examine your explanation.
Cheers.
"It's always a long day, 86,400 won't fit into a short."