Thanks for the answer.
I did what you do, so I found the MoW key in the regedit with my login name, but I can't find the password in the settings.set. There's only this:
{settings
{name Player}
{mp
{gs_users}
{chat_sort sort_name}
And stuff under...
Is it because I uninstalled and reinstalled the game?
Is deleting the regkey the solution?
Anyway, thanks very much for your help.