This wireless network you are trying to configure would be easier done by following the installation proceedures of the wireless router that you will be using.

While most are simple configured there are some security issues that will need to be checked and verified before you can get it to work properly...The wireless routers all have their own way of set-up.

basically speaking the internet comes in through the modem then throughthe wireless router either connected by LAN or USB....again depending on manufacturer.

Use your built in help files in windows XP and there are complete diagrams under help\networking