I would recommend you turn off all encryption until you have the network up and running. One person needs to log in to the router with a lan cable (plug it in and open a web browser, and type in the appropriate ip address... my netgear is 192.168.0.1 you could try that or you could read the intructions

) once there, make sure: The SSID is whatever, ie Big Red Router or something. turn off all encryption (WEP and WAP are types of encryption) and keep all other options as default... if you're not sure what defaults are, try resettin the router to default factory settings (read instructions to find out how to do this, i has a tiny button you needed to push with a pin) and start from there.
Also, make sure your IP settings are being automatically designated (network properties ---> tcp/ip, configure ----> automatic)... um what else.... oh yeah, reset the router and modem, and wait for a minute. turn on the modem, and after all the lights are on, turn on the router.... maybe im being no help at all... these are the things that helped me on a number of ocassions.