HOld On here,,
Go into internet explorer and in the address line, type in the address of the wireless,,, probably
http://192.168.2.1 you will get a window prompting you for a password ,, defaults are usually " admin "
You need to look at the configuration of the base station first,,,
get the CHANNEL that your wireless is on AND the SSID name of your wireless network,,,
once you have this info,, Install the new USB card to your basement PC,, then set the config to the Channel that you wrote down,, and enter the SSID name into the config of the card,, you should be asked for these,,
AFTER you have your TWO pc's online,, you then run the XP home networking wizard,, you need a floppy disc while doing this,, you first run it in the XP machine,, then take the config on the disc to the basement machine,, you will have prompts on how to run this ..
these are the basics,,, BUT YOU MUST READ THE MANUALS that came with the hardware to FULLY understand the configuration,,
it is easy to ask,, but harder to understand,,
This is a user friendly task,, so you should have a 90% chance of getting this going quite easily...
cheers