Sounds like your laptop is set for DHCP and the router is not, or the other way round. Use a cable to log onto the router. Address usually 192.168.0.1 Just put this into the address line of internet explorer. A log on box should appear asking for a user name and password. These by default are Admin and password. Once you are into the router setup you will be able to check all settings. If you have anymore problems drop me a line.
Mike