Follow the prompts to install the update. As you already know, Microsoft Security Essentials (aka 'Windows Defender' in latest OS versions) is a free full-featured anti-malware solution that is capable of detecting and stopping potentially malicious software and viruses, and its included in Windows 8, 8.1, Windows 10 and Windows Server 2016 edition.When the file has finished downloading, go to your Desktop and double-click the file (it will be called mpam-feX86.exe, or mpam-feX64.exe).In the table left, click on the link that will work for your version of Windows.Check whether your version of Windows is 32-bit or 64-bit.How to download and install a Microsoft Security Essentials update: Microsoft Security Essentials runs quietly and efficiently in the background so that you are free to use your Windows-based PC the way you want - without interruptions or long computer wait times. It's easy to tell if your PC is secure - when you're green, you're good. Microsoft Security Essentials is a free download from Microsoft that is simple to install, easy to use, and always kept up to date so you can be assured your PC is protected by the latest technology.
Microsoft Security Essentials provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software.