I'm using a window 7 with wireless & cable equipments to connect to internet, it's been fine for moths. But Three days ago, the local connection ran out of control and i can no longer use the cable to get access to internet. But fortunately the wireless equipment still works. I reinstalled the driver, took off/inserted in the cable, the computer still didn't work. And every time I let the computer diagnose itself, it told me that :"Default gateway is not valid"(or something else, forgive my terrible english XD). If anyone could give any advice, i will be very appreciated. And I'm in california, but i don't know the gateway of this area.