In order to fix the issue, press Windows + Pause/Break key combination and open the Device Manager. Expand the USB (Universal Serial Bus) controllers list, right-click on the magicJack device and select Uninstall. Reboot your PC, connect the device, press Scan for hardware changes button from Device Manager and wait for Windows to retrieve the drivers. If this doesn't help, you will need to visit a local service center or to contact the Support team.