Bought our son a Dell Dimension 2300 desktop last year for Christmas.

This year an Inspiron Laptop w/wireless card, and a Dell 2300 router. The Dell router has

all Ethernet ports, his existing cable modem has (1) Ethernet, and (1) USB port. The PC has NO

Ethernet ports, only USB ports. I can use an Ethernet cable between the cable modem and the router, but to connect to the 2300 desktop, which has only USB ports, and the router only Ethernet

ports, I am unable to make that connection. USB to Ethernet???? Sure  would appreciate any help!