system
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Download Avast Free Antivirus Setup. http://files.avast.com/iavs5x/avast_free_antivirus_setup.exe
Visit Registration page to get one year free license, http://www.avast.com/registration-free-antivirus.php
Enter the details and make sure that you entered correct email address as you will get all information and key on your email
Now you will get the details to activate Avast Antivirus for one year with key