Webroot Internet Security Essentials 2011
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Full user review
"Clumsy and SLOW"
Effective scanning and the firewall doesn't consume system resources.
Updates, however, stop everything. Instead of using automatic updates that could run in the background, I have to do it manually when I'm not doing anything for 5 minutes. I've used many security programs and this is the most annoying.
I would recommend COMODO Internet Security. It's FREE and doesn't have the annoying quirks like this one. Although Webroot anti-virus and spyware programs are awesome.