I am not sure where you are seeing this error message. Once the
device shows up properly in the Windows Device Manager, you should be
able to simply refresh the device list in Measurement and Automation
Explorer and see the device. It should not be necessary to
manually add the device in MAX if it is already present in the Device
Manager. To refresh the device list, press F5 in MAX, or select
View->Refresh from the toolbar.
Jason S.
Applications Engineer
National Instruments