Hello,
National Instruments is looking into developing drivers for 64-bit operating systems, but unfortunately there is no current VISA driver available for 64-bit. While we are in development, however, a potential workaround would be to install a 32-bit OS on your 64-bit machine. You will not be able to take advantage of all 64-bits using a 32-bit OS, but the 64-bit operating system only provides more memory space, not faster performance. When you use a 32-bit OS, you can use all of our normal drivers without any problem.
Have a great day!
john m
Applications Engineer