I've now got the machine to join the domain, but when I login I get "The security database on the server does not have a computer account for this workstation relationship" if I use a new computer name when I get prompted, if I use a name of the machine that was there before I get a trust relaionship error. So it appears that the machine thinks it's on the domain, but it isn't. So I need to remove it from the domain and re-add it to make it work. I still have no luck with the regional settings.