That IP you got is a proxy seerver so they are using that to spoof their IP address, Now, make sure you did not get keylogged, change all your passwords to a 15 charachter mixaplhanumeric symbol password, example: P@ssw0rd or P@sSw0rd123456789 or a very long one like geekmaster1@p@sSw0rd.com, I guarantee you that they will not get your passwords to log in unless you got keylogged. And change your passwords quite often. every 3 months or so. And dont use the Administrator username, change that to something else which wont be in a dictionary and which is too long to brute force like your nick.

Astalavista!