Cant load GPIB-32.dll

I am trying to connect by NOVOCONTROL Impedance analyser using a GPIB-USB cable. I have also installed GPIB-488 version 2.3. But i am getting the error saying "cant load GPIB-32.dll". I am a beginner.

Please help. 

Before I had NI-488.2 installed on my system. Still the error showed then.

Please help!!