Repost: Probably the Best Free Security List in the World
The list below is regularly updated by the guys at TechSupport Allert and it contains lots of free security tools.
From Realtime protection to System rescue, this page has it all.
Of course, if you are an advanced user, you already know what you need and how to set up your computer’s security, so there is a chance that you won’t need this list.
But, if you are a rookie and you don’t know what you need to install, then do the Security Wizard on TechSupport and they will help you with recommendations based on your answers.