[bedoig]

Well, I'm about out of ideas. Are you actively using a bluetooth connection on your phone for something else while you're trying to connect to your network? Bluetooth and WiFi share an antenna, so using both simultaneously causes conflicts. You could try disabling bluetooth.

Other than that it looks like it might be hard reset time. Don't install ANY programs, and if it still doesn't work after that you are probably looking at a hardware failure, and you should exchange your phone.