Hello People

I have just bought a second hand Netgear wireless modem router DGNB2100 to replace my freebie talk talk router.
As i want to connect to my pc with the wireless usb, i have the netgear down stairs, this is plugged into my xbox 360 via a ethernet cable. When i switch the router on i get green solid lights for the power, the wireless, and the dsl lights, but that is it. When i switch the xbox on the internet light turns red after a few seconds when trying to connect to xbox live. I cant get the wireless usb adapter to connect to the router ethier. Any help would be super.