Hey Hal,
I have also been unable to find a LabVIEW driver for this instrument, either from National Instruments or HP. If you are wanting to purchase this device, you will need to build your own driver. The process for creating one would depend upon its interface. For instance, is it GPIB, serial, etc.? Once you know this, you will need to know the commands which the instrument accepts and then build VIs which send these commands to the instrument. Then use these VIs as your driver.
J.R. Allen