USB-to-Serial dongle support installation If you've installed a retail version of Windows XP and want to use a serial device, you'll need to install this dongle. 1. To start the installation, plug the USB-to-Serial dongle into one of the USB ports on the HP Notebook 2. The System automatically installs “USB high speed serial converter” and “USB serial Port”, without any user prompting. 3. You may have to reboot before the system will detect and install the driver for your specific serial device.