Quote from urrterrible:
First off if you are real worried about security, you can run a dual boot machine with linux. I run Ubuntu.
Second, you do not need an antivirus at all if you know what you are doing. Firewall I agree with, but not AV.
If you want to realm the internet dangerously and download shit and codecs and cracks just use a "Virtual machine" via the free program VIRTUALBOX.
Install VIRTUALBOX, then install windows onto that virtual machine. Load it on top of your current operating system that you do not want to infect and you can have a field day on the internet with no worries. You can at the end of the day just revert back to your clean installation.
I used to test viruses using VMware like this.