Hello eharley, The most recent NI-DAQ driver that supports LabVIEW 5.1 is 6.9.3. The free download can be found <a href =http://digital.ni.com/softlib.nsf/websearch/50F49E43A22C0D2186256BF3006B9A96?opendocument&node=132070_US>here</a>.
Have a nice day! Robert M Applications Engineer National Instruments
