D-Link DSL-302G - 8 Mbps DSL Modem Quick Installation Manual page 5

If you are connecting to the modem using Ethernet cable, connect the Ethernet cable and click on Next
If you are going to connect to the modem via USB cable, DO NOT connect the USB cable at this stage.
You will need to connect the USB cable after finishing the software installation and rebooting the
computer.
* If you connected the USB cable before installing the driver please refer to paragraph 3.1.1. of the
Troubleshooting section at the end of this guide.
Click on Next