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_viOpen() for GPIB not working on Windows 7 64-bit system?

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I am using AutoIt to control test instruments connected via GPIB. The following scripts should work to open a GPIB session using VISA libraries installd on the computer. Somehow, the _viOpen() command does not seem to work on my Win7 system. However, the code works fine when running Windows XP Virtual Machine on a Win 7 system.

Any ideas why it is not working in the Win 7 environment? (BTW, my PC is a 64-bit system, and I am running AutoIt in 32-bit mode.)

#include <Visa.au3>

Local $h_session = 0

; Query the ID of the instrument in GPIB address 28
MsgBox(0, "Step 1", "Open the instrument connection with _viOpen")
Local $h_instr = _viOpen("GPIB0::28::INSTR")
MsgBox(0, "Instrument Handle obtained", "$h_instr = " & $h_instr) ; Show the Session Handle

MsgBox(0, "Step 2", "Close the instrument connection using _viClose")
_viClose($h_instr) ; Close the instrument connection


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If the driver layer is installed as x64, you need to run caller application in x64.

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