How would you know if your system is safe or not? The high chances are they are not secured if you haven?t used any antivirus solution. Like most internet users, your device may also be susceptible to a load of suspicious content on the internet. This is why we need a permanent solution to prevent this. McAfee Internet Security is an antivirus solution necessary to protect your online activities and system. To activate this software, first, download it and visit mcafee.com/activate.