Hello,
Do you get an error number associated with the issue? You may try upgrading your BIOS, however, there are sometimes problems using certain PCMCIA slots with PCMCIA cards. The following NI KB notes that a BIOS update may help:
http://digital.ni.com/public.nsf/websearch/3E5465A561E2BA0986256B6E0060E785?OpenDocument
Repost if you still have problems; unfortunately, sometimes these issues come down to the slot manufacturer compatibility with a given pcmcia card.
Best Regards,
JLS