What kind of setup is this exactly, at work, at school, in your house? Need details about the exact setup. Logging into Windows is just a logon to Windows, should have nothing to do with the internet connection unless you are on some managed connection. And if you are, contact the IT department for this.They are not locking Mac addresses... No website login required. Just have to enter your username and password to log into windows and your good. I've tried to just plug a router to a ethernet cable but it says no internet access.