Hello,
In order to reinstall your hardware, you will want to ensure that you power down your computer, remove the board, power up, install NI-Serial, boot down and install the GPIB board again, and reboot your system. This will ensure that the serial driver is in the system before the board itself. A great reference for getting started with your board is the user manual and getting started manual for the board. You can find these manuals on www.ni.com by searching for "AT-485." If you have further questions, please let me know.
Anthony Bacak
National Instruments
Applications Engineering