The scenario you describe has supposedly been accounted for. Another "account" can take over a position for an account that can no longer participate. Playing as that new player and knowing the old password should allow that new account to resume play.
This makes me think due to the error message that it is possible using the _same_ account name before (not player name but account name) or there is some path a little further down the line that is not in line with this procedure.
As far as having account info, I do not need it. I would like to have the game before the machine crash player takes the turn and after the machine crash player.
If you have managed to resurrect the machine, if he can copy the Game Data Directory set of files (everything) get them off machine and place them over the appropriate location on the new machine, then life should be able to continue without any interruption for that player - including the old account. The location of this is approximately in the AppData/LocalLow/KBSW/EmpireDeluxe directory - or it can be configured as a different directory.