My building has a free wifi service. There are routers on each floor. My computer has built in wireless lan. It will recognize signals from those who have installed ATT's 2wire system, but not a single signal from and othe routers in the building. I am now using a usb wifi adapter which has detected all the signals. I have reinstalled the drivers and tried to connect the wireless lan but it has been unsuccessful. The windows connection software will not work. It seems strange to be able to detect the ATT connections but not any of the buildings signals.