Hello,
Thanks for contacting National Instruments. I'm not sure what OS and board you are using, but you can find most of our GPIB drivers at the following location.
http://digital.ni.com/softlib.nsf/webcategories/85256410006C055586256BBB002C101C?opendocument&node=132070_US
Also, what is wrong with your driver that makes it bad?
Regards,
Steven B.
Applications Engineering
National Instruments