Shame it's only for Windows And if something you look up does turn out to be Spyware etc., killing it will only be a temporary solution, since it'll likely restart again next time you boot the computer up. Preventative measures like tightening up IE's security or using something other than IE such as Firefox so you don't get any more of this software would be a better thing to do Other software that can be a security problem are Kazaa and AIM.

Therfore, my useful links shall be:

Ad/spyware finder/remover: http://www.lavasoft.nu/
Browser replacement: http://www.mozilla.org/products/firefox/
AIM/YM/MSN replacement: http://gaim.sourceforge.net/downloads.php