Try
USBDeview.
USBDeview is a free and small utility that lists all USB devices that currently connected to your computer,
as well as all USB devices that you previously used.
Do not connect your reader and run USBDeview.
Uninstall the Kobo device driver (or multiple Kobo drivers), and reboot the computer.
Connect the reader to the PC and wait until Windows detects and installs a new/fresh usb device driver for your Kobo reader.