CW shredder http://www.softpedia.com/get/Interne...Shredder.shtml

spybot: http://www.safer-networking.org/en/index.html

Adaware SE: http://www.lavasoftusa.com/software/adaware/

There are some links for the freeware.

I want to mention also that the computer tech for the company I worked for first recommended adaware to me and used it regularly.