The problem you are seeing likely does not have to do with LabVIEW, but more likely with the GPIB drivers. If you did a full install of LabVIEW 6, it probably installed new drivers over the old ones and might have caused some problem. You aught to be able to test the 488.2 drivers and the device communication using MAX (Measurement and Automation Explorer) If have trouble communicating with your device in MAX, might want to consider completely uninstalling the drivers and reinstalling.