I'm no tech expert by any means, but my comet 
cursor software comes with a free "starware ad 
zapper." I know I didn't have to pay for any of 
these services, but I'm not sure if things have 
changed. Anyway, here are the links if you are 
interested.

http://www.cometcursor.com/
http://www.starware.com/

Hope this helps,
-Snake-