heres my set up

cable modem-> wireless router-> acer vista laptop-> ethernet cable to 360

worked before i turned of my 360, unplugged the ethernet cord and plugged my laptop's ethernet cable directly into the router (because i lose wireless internet when someone is on the cordless phone and i was doing something important on the internet)

phone call ended and i placed the computer back where it was plugged the 360 back into the laptop and now it say "your console was unable to negotiate a lease with your DHCP server. make sure that addresses are available on your server"

i tried unplugging everything and turning them back on starting from the modem up the order.

what do i do now?