mcafee.com/activate: You can purchase McAfee antivirus on-line and offline yet. for purchasing it on-line, you wish to go to the official web site of McAfee, www.mcafee.com/activate and find the McAfee activation key on your registered email id. Save that McAfee activation key because it are going to be needed at the time of installation. Before downloading, putting in or activating any McAfee product, check that your system meets the specified specifications. conjointly check that there’s no alternative security software or antivirus already put in on your device because it would lead to software conflict error.