Download and install Norton antiviruses on Apple Macintoshs, including Antivirus Suite 3 and AntivirSuite 4, for free.

It is also available for Windows PCs.

Antivirus suites Norton, Avast and Kaspersky are all free and available on the Apple App Store.

Apple Mac users can get the free Avast Suite 5 for $4.99, or download the Kasperskin Antivire Suite 3 for $19.99.

Microsoft Windows users can also get the Avast suite for $9.99 or the Kansan antivirus suite for free on the Microsoft Store.