1. check your tcp/ip properties. obtain an ip automatically should be checked.
2. scan to find your router. (use cable to setup your router, assign your router a new name so that you can know it.) if your computer can find the router, connect it (maybe need secure code). if not, radio should be off, change your router setting. try again.
3. if still problem, reset your router to try. (there is a hole on the router)