Protect your PC

Microsoft Security Essentials

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 Need security for your business? Microsoft Security Essentials is available for small businesses with up to 10 PCs. If your business has more than 10 PCs, you can help protect them with Microsoft System Center 2012 Endpoint Protection . Click here for more details.