http://www.spyaxe.com/index.php
It shouldn't be on your system unless you installed it.
(http://www.microsoft.com/downloads/details.aspx?FamilyId=321CD7A2-6A57-4C57-A8BD-DBF62EDA9671&displaylang=en ).
I would also recommend AdAware
( http://www.lavasoftusa.com/software/adaware/ ),
and Clean-up
( http://www.stevengould.org/ ).
The free program available from Yahoo is nalso pretty good.
Thanks!