I have to do some measurements using a GPIB A with win2000. With the new drivers 2.4 windows tells me this is an obsolete hardware and it cannot find a good driver, so I tried to download the file ni488222 as suggested. Now, the file during the download process is about 111M but at the end it is just 10M; also when I try to open it windows tells me that this is not a valid win32 application (I downloaded the win2000 version).
To find the correct version for your device. I would recommend taking a look at this GPIB Driver Compatibility Link. When you click on the driver, it will say at the top which OS it supports.