Hello Lecroy,
The GPIB ENET 100 is supported in Windows Vista x64.
NI 488.2 version 2.5 provides support for your Operating System.
This information can be found
here.
You will need to be logged into your NI profile to view the content of that page.
Kindly navigate to the readme file and you will find information about
what Operating Systems are supported and any updates from previous
versions of the driver.
I hope I have answered your question?
Christian A
National Instruments
Applications Engineer