Sorry to be the bearer of bad news, but as far as I know, you're several steps removed from getting that combination to work together.
1. The 6251 is an M-series board which requires the DAQmx driver.
2. The DAQmx driver is only compatible with LabVIEW 7 or later.
3. LabVIEW 7 doesn't support Windows 98. At least not 7.1. Less sure about 7.0.
4. LabVIEW 7.x isn't available for purchase anymore anyway.
Something's gotta give... The cheapest path forward may be to buy a board or two that can run under LV 5 and the traditional NI-DAQ driver. You'll probably need at least 1 E-series board and maybe others to provide functionality similar to what's available in an M-series 6251. Depends on what you need it to do.
-Kevin P.
ALERT! LabVIEW's subscription-only policy came to an end (finally!). Unfortunately, pricing favors the captured and committed over new adopters -- so tread carefully.
