Hi uandave,
I guess you are using a standalone cable modem, it sounds like it. All you should need to do is remove the usb cable, connect the ethernet cable. reboot modem (power off 10 secs then switch back on) and reboot pc.
Are you getting an ethernet light on modem? Have you checked the ethernet card is correctly installed in device manager?
Robin Walkers site has some handy tips
http://homepage.ntlworld.com/robin.d...ips/index.html
Hope this helps