Do you have any other VISA libraries installed in the same computer? I had a similar problem some time ago with a different device, the cause was conflicting versions of VISA drivers installed (I have Keysight's and NI's). I managed to solve the issue restoring the installation of the libraries.
Try this:
In the "Control Panel" open "Uninstall a Program" find the Keysight IO Libraries on the list e then click in "Change". The installer will show three options, select "Restore".
Post time 2019-9-15 23:05:45