|Disable the wireless. Make note of any settings that may be unique. |
Enable if not already the wired and plug it in. Usually homes are set to dhcp and let the router offer an IP and gateway and dns servers. It should then acquire an IP address.
Check with command ipconfig. If not then look at router for any settings or check cables or nic's for problems.
Why did it take me over a year to phone in a problem to ATT?