What exactly do you mean by “reformat”? Different operating system? Have you switched from 32-bit to 64-bit by chance?
It’s almost impossible to diagnose your situation when you haven’t mentioned anything about your computer specs.
Are you using a USB3 port? If so, try a USB2 port.
And you’re sure the driver installed correctly? Did you get any errors or alerts during installation?
The device is unplugged when installing the driver, correct?
Are you installing and running everything “As Administrator”?
Have you tried installing the driver in one of the Windows “Compatibility Modes”?
What did Native Instruments support have to say?
Without more info from your end, no one can help you.