Are you using the native Windows PCMCIA socket driver? If not, I would suggest to uninstall the 3rd party PCMCIA socket driver and install the native Windows socket driver from the Windows XP CD. I would also try to upgrade to NI-PAL 1.6.1 by downloading the attached NI-PAL (ni-cdu1610.exe), and run the installer. I hope this helps.
Regards,
Todd D.
National Instruments