Run the installers bellow, restart LabVIEW6 and then select the following from the menubar:
Tools>>Instrumentation>>Update VXIplug&play Drivers...
Select the driver to convert to LabVIEW and hit "OK"
8560 Series VXI-PnP driver:
http://ftp.agilent.com/pub/mpusup/vxipnp/winnt/supported/856xe.exe
8590 Series VXI-PnP Driver:
http://ftp.agilent.com/pub/mpusup/vxipnp/winnt/supported/859xe.exe
The Instrument drivers will now be in your Functions>>InstrumentI/O>>InstrumentDrivers palette.
-Jim