i remember people who had this problems after trying to remove the advertising banner. there's was a small program which you installed and then the banner is gone.
i've solved this problem once at one friends computer with reinstalling icq and remove the banner manual.
something private:
wollte Dich ürbigens eh schon fragen warum Du mich noch nicht im ICQ geadded hast ...
jetzt weiß ichs :)
also man liest sich ...