Its really very easy to activate McAfee antivirus online using the internet. Go to the website activation link¬*www mcafee com/activate¬*and you will find a form here. In this form enter your 25 digit product key which can be found on your McAfee retail card, and then click on "Activate". If you face any problem during this activation process, call McAfee key activation toll-free number 844-865-6999 for quick and easy assistance.