I tried to install Microsoft Security Essentials 4.1 Beta, but the installation fails and syas that Windows Defender is up to date and it isn´t necessary to install MSE. But Windows Defender isn´t so complete like MSE. It dóesn´t have the icon on tray, it doesn´t have a network protection, and I can´t configure Cpu usage while scanning. Can I trust in Windows Defender ? Exists a way to install MSE 4.1 Beta on Windows 8 RP? thanks