Atheros does not make network cards, they make network chips and sell them to network card manufacturers. We need to know who that manufacturer is and what the card model number is and what computer it came installed in.
Did it come pre-installed in your computer at the time of purchase or did you purchase it separately then add it to the computer via a PCI/PCI-E slot?
Used in a laptop or desktop computer?
Computer/Motherboard brand and model?
Did it come from the factory with Windows XP installed?
You can check the chipset makers website here: http://partner.atheros.com/Drivers.aspx