Hi Demo,
You should definitely consider upgrading LabVIEW. You can probably get an "evaluation" version of LabVIEW 7.0 prior to buying it to check if your program will still work. Contact your local NI sales rep for more information.
The LabVIEW 5.1 version of this driver is attached below.
Regards,
Vesna Jadric
Instrument Drivers/IVI