Hello:
Refer to "Getting Started Manual for PCMCIA-GPIB" ftp://ftp.ni.com/support/manuals/321040b.pdf, Appendix B - Troubleshooting. "What do I do if I have installed the NI-488.2 software and now my Macintosh crashes upon startup?"
Hope this helps. If you have any questions, please let us know. - NI Support