What is McAfee's activate product key? An activation key is a group of 25-digit unique alphanumeric characters. It is a must-have if you wish to activate McAfee product on your system. Keep the code handy as it will be used afterward. What is Mcafee antivirus? Mcafee antivirus can perform Quick, Customized, or Full System scan based on your need. McAfee antivirus detects and completely removes any sort of threat that your system may face. Be it Trojan, malware, virus, or worm McAfee antivirus can handle them. You just need to visit mcafee.com/activate in your web browser to download McAfee in your system using a 25 digit Activate my Mcafee product key . You can follow the steps mentioned below to McAfee activate product key on your devices:- In the first step, you have to visit the website www.McAfee.com/activate. If you are an existing user, you have to log in to your McAfee account. If you are a new user, you have to create a new account with McAfee. For creating a new account