This article gives you the exact information :

The Top Three
http://bluecollarpc.net/phpbb2/viewtopic.php?t=228

There are more here - actual professional reviews - *not* user reviews
sometimes called "newbie press hype"....

Software Reviews
http://bluecollarpc.net/phpbb2/viewforum.php?f=4
Administrators, Advanced Members, Professional and Expert Reviews.

Since you are shopping you definately should check things here:

"Very Important Message about anti-spyware software: "
http://www.bluecollarpc.net/pcsafety.html
"It is very sad to mention that this sector of Computing Security is a
jungle. Not like others, anti-virus or firewalls. There are many bad
or fake anti-spyware softwares out here that actually hi-jack your web
browsers for one to try to force purchase to get your PC back. This is
a must website to view before purchasing any anti-spyware software !
Note that there are legal liabilities for professionals in reporting
bad software and this is a compliant website and very known at forums
and groups: "

Title: The Spyware Warrior List of Rogue/Suspect Anti-Spyware Products
& Web Sites
Description: Bad, False, Fake products
URL: http://www.spywarewarrior.com/rogue_anti-spyware.htm

Forums Owner
BlueCollarPC.Net Forums


Dave {ð¿ð} wrote:
> With so many different anti-spyware programs to chose from it's difficultto
> know which are the best to install. Is there a comparison site that looksat
> what is available and compares their performance to each other? If not,
> what is the best to install on a PC running Windows XP?
>
> Thanks,
> Dave