Probably have the default name (LinkSys), and someone nearby got another and didn't change the name.
You have to open the browser to the GATEWAY address, and supply the username and password. This will allow you to reset the WIFI section.
You can also press the reset button, which returns the router to default configuration, but you'd have to set up everything else at the same time.
-David
2006 Microsoft Most Valueable Professional (MVP)
2006 Dell Certified System Professional (CSP)