Microsoft Security Essentials is a free* product you can download to help defend computers running Windows XP, Windows Vista, and Windows 7 against viruses, spyware, and other malicious software.
Why should I download Microsoft Security Essentials?
- Comprehensive protection—Microsoft Security Essentials helps defend your computer against viruses, worms, Trojans, and other malicious software and provides you with free spyware protection.
- Easy to get, easy to use—Microsoft Security Essentials is available at no cost, so 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 spyware 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.
Note: In Windows 8, Windows Defender replaces Microsoft Security Essentials. Windows Defender runs in the background and notifies you when you need to take specific action. However, you can use it anytime to scan for malware if your computer isn’t working properly or you clicked a suspicious link online or in an email message.
* Your PC must run genuine Windows to install Microsoft Security .