Support Information:
Device Type: Network Adapter
Manufacturer: Atheros Communications
Model: AR5BMB5
Interface: Other
Operating System: Windows XP Professional
Age of Device: < 2 years old
FCCID: PPD-AR5BMB5

Find it on DriverGuide (http://members.driverguide.com/index.php?action=srch&sm=b&aax=&qa6=2100&qa5=12&qa7=1500&dp=2&qm0=AR5BMB5&jmd=and&fzz=d) | Find it with Google (http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=Atheros+Communications+Network+Adapter++AR5BMB5+ Windows+XP+Professional+PPD-AR5BMB5) | Research manufacturer Atheros Communications (http://members.driverguide.com/index.php?action=getinfo&companyid=2100)

http://www.atheros.cz/

you can give this site a shot but i have no clue if they will work, cause i found it by chance looking from drivers for the WPN111 with the Atheros AR2414 chipset
good luck