I'm using a Windows 7 with wireless & cable equipments to connect to internet, it's been fine for months. 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). 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.