Or, you can stay with your current, baseline free antivirus protection. In order to continue, simply re-register your software and you can use it free for another 12 months: receive automatic updates to both the software and your virus database.
How to register?
Open your avast! program via the desktop icon or Start menu
Click ‘Maintenance’ in the left pane and from the unfolded submenu select 'Registration'
Select ‘Register’ in the left menu
Click the ‘Register now’ button in the main white area
Select your option, fill in the form, and submit it
You are then protected for another year.