Microsoft Security Essentials against spyware, viruses, worms, Trojans, and other malicious software.

Help protect your PC with Microsoft Security Essentials

Microsoft Security Essentials is a new, free consumer anti-malware solution for your computer. It helps protect against viruses, spyware, and other malicious software. It's available as a no-cost download for Windows XP SP2 and higher, Windows Vista, and Windows 7.

Download Microsoft Security Essentials

Why should I download Microsoft Security Essentials?

• Comprehensive protection—Microsoft Security Essentials helps defend your computer against spyware, viruses, worms, Trojans, and other malicious software.
• Easy to get, easy to use—Because Microsoft Security Essentials is available at no cost, there's no registration process that requires billing or personal information collection. It installs after a quick download and Genuine Windows validation and then stays automatically up-to-date with the latest protection technology and signature updates.
• Quiet Protection—Microsoft Security Essentials doesn't get in your way. It runs quietly in the background and schedules a scan when your computer is most likely idle. You only see alerts when you need to take action.

Microsoft Security Essentials security status

Microsoft Security Essentials has a clean, simple home page that shows the security state of your computer.

A green icon means that the security status of your computer is good. Microsoft Security Essentials is up -to- date and is running in the background to help protect your computer against malware and other malicious threats. When your computer has an issue that requires your attention, the look of the Microsoft Security Essentials home page changes based on the issue. The status pane turns either yellow or red depending on the situation, and an action button appears in a prominent location on the page with the suggested action.

A yellow icon means that status is fair or potentially unprotected and that you should take some action, such as turning on real-time protection, running a system scan, or addressing a medium-severity or low-severity threat.

A red icon means that your computer is at risk and that you must address a severe threat to protect it. Click the button to take the recommended action and Microsoft Security Essentials will clean the detected file and then do a quick scan for additional malicious software.

For more product information and to download the product, visit Microsoft Security Essentials.