Hello;
It's looking like the NI-DAQ installation got corrupted for some reason, and now both cards can't be recognized by the OS anymore.
The best way to go about that is to remove both boards from your machine, reboot the machine, uninstall the NI-DAQ driver completely from Add/Remove Porgrams, reboot the machine, reinstall the NI-DAQ driver, reboot the machine and put the boards back.
Since you had that working before, the reinstallation of the driver should fix the problem.
Hope this helps.
Filipe A.
Applications Engineer
National Instruments