While it appears you installed the OS you have to hunt for drivers for said card. To use wireless without the card I've used those GAME BRIDGES (see google.)
I have installed 98SE on a Compaq Evo N610C which came preinstalled with XP. I can connect to the internet with my BT cable, but I can't use wireless because I don't have the card (I've installed the driver). Can I use wireless without the card? If so, how?