Microsoft Security Essentials

Use Microsoft Security Essentials to help guard against viruses, spyware, and other malicious software. It provides real-time protection for your home or small business PCs.

Microsoft Security Essentials is free* and we designed it to be simple to install and easy to use. It runs quietly and efficiently in the background so you don't have to worry about interruptions or making updates.

Key Features

Comprehensive malware protection
Supports Windows 7, Windows Vista, and Windows XP
Available in 33 languages
Simple, free* download
Protects you quietly in the background
Automatic updates