OttoBerge,
A couple of more items worth considering:
1. Vista 2 machine is using NI-VISA 4.0. The earliest support Vista is NI-VISA 4.2. I would update the driver on that computer to see if that changes any of the results. Here is the link to
NI-VISA 4.2.
2. For your USB ports if you go into the BIOS you can change the port speed. There should be 2 speeds full speed and high speed. I would change the USB port speeds on the two computers that don't return data to the other choice and see if that makes any difference.
A_Ryan
AES
National Instruments
