to the forums.
As DarthYoda says, you can only connect one at a time and will need to turn off the modem and on again everytime you change from USB to Ethernet.
Both will not work.
Your best bet is to get a router. They cost about £25 to £30 and I reccomend the Linksys models.
Your cable modem goes into the back and then you can connect normally upto 4 computers / laptops to the router and all be connected to the Internet.
Reouter reccomendations here:
http://www.cableforum.co.uk/board/87...info-here.html