I have AT&T and have had no problems connecting to my WiFi. Now, all of a sudden when I open a browser, the window opens demanding my Cisco Connect password. I don't have a Cisco router. I'm using AT&T, so I can't go into the Cisco registry. I can't go online at all --- I'm at the library using their computers to access the Internet because I can't access it at home. How do i get rid of this?