'Tis something in the FH coding that is setting y'er log-in screen to WaterMill. If ye wish to change it, all ye 'ave to do is find the coding file for this situation. Unfortunately, 'tis where my /not really/ helpfulness ends. I 'ave checked through my files and 'ave yet to find this file. If anything new comes up, I shall let ye know. Best of luck.
And of course, ye can just reinstall the game like IceTehWolf suggested instead of going on a wild goose chase.