Spybot - Search & Destroy
Very good
Full user review
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"Slowed XP by adding entries to hosts file"
Pros
(10 filler chars)
Cons
Spybot grew C:\WINDOWS\SYSTEM32\DRIVERS\ETC\HOSTS from 1KB to 450KB with additional entries, causing svchost.exe to occupy CPU for many seconds at a time when loading some web pages. Found problem with Process Explorer, and solution at *****/1Oznne .