If you just need to acquire data using VB 6, we do provide DAQ activex controls with the DAQ driver. The controls provide for Analog Input/Ouput functionality that you can use with the SCXI 1120. This way you wont have to deal with dll's. You can find VB examples under ..\NI-DAQ\Examples\Visual Basic with Measurement Studio.
Make sure you have the newest NI-DAQ installed, currently at 7.1
Bilal Durrani
NI
Bilal Durrani
NI