Dennis, you are sort of on the right track, but there isn't a GPIB DOS driver per se that works NT, 2000, or XP. Instead, try enabling DOS Support.
hil, here's a link with information about how to enable DOS Support in NT/2000/XP:
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/862567530005f09c862565850060ce6d?OpenDocument
Hope this helps.