D-Link doesn't seem to have USB drivers available for the Mac. You don't even need drivers if you use the ethernet connection. All Macs have at least one ethernet port, can you use that instead of USB? You also have a more stable connection through ethernet, compared to USB...
If you have more than one computer, you need to get a small switch and have one of the ethernet ports connect to the ethernet port on your DSL modem (if it has one available in place of using the USB port).
