Re: DRIVER NEEDED: linksys wmp54gs (Windows XP Professional x64) [PCI / ISA]
Linksys/Cisco made 2 versions of this board. You will have to go here first:
then select version 1.0 or version 1.1 (from the drop-down menu) in order to see what drivers are available. If XP x64 drivers are not there, they probably don't exist.