Hello,
You posted your question in the wrong forum. This forum is for questions pertaining to the National Instruments product "Measure for Windows". Nevertheless, I think I know where you need to look for this driver. Go to http://www.ni.com/support/gpib/versions.htm , where all the drivers for all OSes are listed for the various types of NI GPIB boards.
If this answer does not help you, please post your question to the Instrument Connectivity >> GPIB forum.
Good luck, and have a nice day.
Darren