Lot of users ( me also) switched from AVG to Avast Free antivirus as AVG 2011 disappointed most of users by eating system resources and slowing down system performance. Avast 6 released with Auto-Sandboxing technology including for free version users, though Avast Free Antivirus is free to use, you need to register it to get one year license key otherwise your antivirus will expire after 30 days.
Registering Avast online is easy by entering your email address but you need to do this every time when you install Avast.
Though requesting registration key by filling a form is recommended for offline users, its always good to have Avast license key available (even for online users) with you to enter and activate it for one year when a case of reinstall is required.
Registering Avast to get One year free license key
1. Visit Avast Free Antivirus registration page, fill out the page by entering your email address and other mandatory details
2. After filling your details Click “Register free license”, you get a message that “registration was successful” license key will be send to your email address with in 24 hours after the registration.
3. When you get license key in your email address, copy it Open Avast User interface click “Maintenance” on the left side of screen to expand and click “Registration” click Insert the license key” shown at the bottom of the screen and enter it to get one year free protection from Avast.