Greetings. Got my wife a Windows 8. (Windows 8 is a classic example of fixing something than wasn't broke). Anyhow, since the security that comes with it is going off soon. I have Microsoft Security Essential loaded on my computer with Windows 7 O/S so we considered that but found that it is not compatible with Windows 8. Furthermore we understand that Microsoft Defender is. We proceeded to start the process of loading it on the laptop and found that Security Essentials is on her computer. We decided to shelve the process until we find out what's going on with this.