I know it would help me, and maybe others, if you could type in some of the headings or messages in your attachments. We could then have them translated.
You state that both of these accounts were added by you? I mean, no other entity added any user accounts you are aware of?
There have been situations where a virus of some type has changed the Administrative user password and taken over the account. Is your second account an administrative user and can you perform administrative tasks?