Do not connect the device to the PC until the driver installation is complete.
If the MF Drivers have been previously installed on the PC, unistall them first using the shortcut on the Start>Programs>Canon>MF Drivers menu. After downloading the file and saving onto your hard disk, double click the file to extract the contents, Installation of the drivers will begin automatically.
Follow the on-screen instructions to complete installation. After installation is complete, connect the device to the PC by USB cable.