How do I activate McAfee antivirus on my computer system?

=11pt=16.0pt[color=#151b26]Unfortunately before a few days, I had no any antivirus software in my computer system. So, my computer had corrupted, that time, I was unable to access it. Now, I have purchased new computer system and so, I want to protect it from all types of virus attacks. I want to activate McAfee antivirus on my computer system. Can I activate McAfee antivirus from mcafee.com/activate? Can you recommend the easy steps for McAfee activation?[/color]