BeeCeeBee is spot on, the router will need to be reconfigured if you did a rest (there will be a small hole on the router that you have to push a pin into to reset it) then all the settings are lost. Go into the routers home page, the address will be on a sticker under the router with a username and password - type the IP address into your explorer, a windows log in box will appear asking for a username and password and hey presto. configure the SSID, encryption etc.
Wired as in Ethernet cable bypasses all security within the router (you need to connect with the ethernet to set up the wireless and log into the router) before you will be able to use the wireless.
If any of this you need help with then let us know.