National Instruments AT-232/2 Getting Started page 56

Appendix C Uninstalling the Serial Hardware and Software
Serial for Windows NT
4. Shut down Windows NT, power off your computer, and remove
your serial interfaces now.
If you want to reinstall the hardware and software, refer to Chapter 2,
Installation and Verification.
Figure C-3. Uninstallation Results
C-4 © National Instruments Corporation