Hello;
At this point, the best way to go about that is to uninstall the NI-DAQ driver completely from your machine, shutdown the computer, remove the board, and reinstall the driver (you can download the latest driver available at www.ni.com/support).
In case you still see the problem, try to swap slots and ultimately change the installation on a different machine.
Hope this helps.
Filipe A.
Applications Engineer
National Instruments