Xavigonzalvo,
First of all, make sure you don't have two drivers in your computer. I mean, you shouldn't have nidaq 6.9.2 and nidaq 6.9.3 in the computer at the same time. If so, delete all of them from Add/Remove Software, and then clean the register. Then, turn off the computer, and unplug the board, and then follow the link below step by step in order to install the software and hardware.
If that wasn't the case, then, follow the troubleshooting suggestions that are under Hardware Configuration >> Data Acquisition Configuration Wizard >> Common Problems >> Windows 2000.
http://www.ni.com/support/install/
Hope this helps,
L Aguila
Applications Engineer
National Instruments