Hi bigred, NI-DAQ 7.1 doesn't ship with VIs that are compatible with LabVIEW 5.1. You'll need to go back to an older NI-DAQ version for this. I think NI-DAQ 6.9.3 has LabVIEW 5.1 VIs, so you can go back to that version, unless you want to upgrade to a newer LabVIEW version.
Joe