The PCI interface ASIC on the PCI-GPIB loads it's personality from an EEPROM on the board. If this load does not occur, the PCI interface ASIC has a "generic" personality and indicates to the BIOS through a PCI Configuration register that it is an "Other bridge device".
Has this PCI-GPIB ever worked? Is there any visible damage to the PCI board? If you are familiar with the registry, you can read the PCI Device and Vendor IDs for each PCI card from the registry. In Windows 2000 the list is at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\PCI. If the EEPROM load is not occuring, there will be a registry entry beginning with VEN_1093&DEV_0000. The normal entry for a PCI-GPIB should start with VEN_1093&DEV_1093.
If the load from the EEPROM is not occuring o
n your board it probably needs to be RMA'ed.