Oh that's sort of a double whammy for the wireless.
Wireless isn't the easiest thing to get working automatically on Linux to begin with, but then you went and use a USB wireless card, which makes it even more difficult.
There's nowhere you can simply plug in a cable to get online ?
The other option would be to check a hardware compatibility list, find a known working wireless PCMCIA card and buy it for your machine.
I'm not saying you can't get the usb wireless to work,. I just don't think it will be that simple with a live CD