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Answers:
Subject to personal preferences. The best doesn't exist. However I resembling using Spybot S&D.
I agree the best is up to your pref.
and I use Ad-Aware Professional.
I really liek it over spybot S&D
Every software have its pros and cons but I rekon Spybot S&D, AdAware and Spyware Blaster
According the the lastest reviews, maxspywareremover.com. It is supposed to be fastest and most thorough.
I hold found Zone Alarm greatly locked to use. Get it from
http://www.zonelabs.com
Spybot is also dutiful. I enjoy installed both.
adaware
www.lavasoft.com
spyboy s&d
www.safer-networking.org
both are free