My all time favorite. You have to create an account and manage the bulk of the antivirus and firewall from there. Works really well on networks, fast, light and still kicks virus butt.
Click on the link above to go to Microsoft’s download site.
Fast, easy to use, easy to maintain and still works pretty good. This antivirus comes with Windows. It’s still supported by Microsoft with Vista, Windows 7 and comes native in Windows 8. Once installed in Vista or Windows 7 you will see a little green flag in the bottom right of the screen. See the image below if you aren’t sure if you have it already or not. This will be in the system tray located next to the time in the bottom right of your Windows 7 or Vista operating system.