Hello Ali,
Your question is quickly answered by our GPIB Installation Wizard (http://www.ni.com/support/gpib) and by our table of Current GPIB Driver Versions (http://www.ni.com/support/gpib/versions.htm). Either one will tell you that the AT-GPIB (non TNT) board is not supported under Windows 2000.
Depending on your location, you may be able to trade in your AT-GPIB board for a newer AT-GPIB/TNT board or a PCI-GPIB board for a discounted price. See the GPIB Controller Upgrade Information link on our GPIB Installation Wizard page for more details.
Best Regards,
Dieter
Dieter Schweiss
Applications Engineer
National Instruments