I upgraded a pre-installed windows 8 version on my Lenovo thinkpad 531 to windows 8.1. Download took hours. In one of the final screens, I was asked to give the password to my local account; it didn't work, so I choose the alternative i.e. to skip this step. Soimehow, the installation went on, but no internet access. I shut down, tried again with the same password and got to Start. No Bing, no access to internet. Baffled. Writing this from another laptop logged into the same account, same server....
At a loss what to do next