MAX can not find "GPIB-USB-B" under" Devices and Interfaces"

Hi,

I am using Labview 2010 with windows 7 system (64bit).

I am trying to work on some program for Keithley 2700, connected with "GPIB-USB-B" with my computer.

The problem is that MAX can not find "GPIB-USB-B" under" Devices and Interfaces" from time to time, everytime I have to restart my computer to find the device. The driver I used is NI-488.2.2.81.

Is there any advice that I do not need to restart computer agian and agian?>

Thanks