Rosaelacrima,
What version of Windows are you using and specifically, is your board an AT-GPIB-TNT?
If you are using the older "AT-GPIB" with Windows 95, then you should be in good shape. Otherwise, consult
This Link to find the appropriate version of NI-488.2 for your hardware and operating system combination.
You need to ensure that you have installed the NI-488.2 GPIB driver AFTER installing LabVIEW 5.0 so that it can properly integrate. If you installed NI-488.2 before LabVIEW, please uninstall the GPIB driver, reboot, and then install it again while LabVIEW 5.0 is resident on the system.
Thanks!
Alan
Applications Engineer
National Instruments