Firstly, thanks to all who have replied to my call for help. @ orrosta Yes, I know NOW that in order to run in offline mode you've got to let Steam check and install any updates. I can't, because I can't get online. The thing that really bugs me is that I tried running the game in offline mode (wireless access point disconnected) when I was at home and had no problems. @ respectfulrat In order to click on the 'remember password' box you have to be able to run Steam (I think). I can't run Steam because it refuses to start in offline mode. Catch-22. @ Rooker75 I'm using Windows built-in firewall. How do I set it to block all network access? I've already tried turning off the wireless network adapter, and that didn't make any difference.