The driver for the PXI-8252 is included natively in Windows. Since NI does not provide the driver for this board, the board will not appear in MAX.
Does the PXI-8252 appear normally in the Windows Device Manager? Are you able to communicate to 1394 devices?
If you connect a 1394 device for which NI does provide the driver, that 1394 device should appear in MAX. For example, if you connect a 1394 camera that is supported by NI-IMAQ for IEEE 1394 then the camera should appear in MAX.