Hi Elmo,
The problem is not the hardware. The two drivers cannot be installed together. You can only have NI-CAN or NI-DNET, not both.
At the moment there is no easy workaround. You mention using NI-CAN to implement DNET. This is possible, but you need the DNET specification to interpret the frames according to the DNET spec.
DiegoF
National Instruments.