Nicole,
With the very few informations you gave here, i can only point you to this webpage:
http://zone.ni.com/devzone/devzone.nsf/webcategories/FF385ADC3E7A8C8A8625679000743B6F?opendocument&node=DZ52328_US
Regards,
Cyril Bouton
Applications Engineer
National Instruments
Cyril Bouton
Active LabVIEW Developper