Protect your PC


Get Microsoft Security Essentials for the low, low price of free


Microsoft Security Essentials is supported on Windows 7, Windows Vista, and Windows XP.

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Get Microsoft Security Essentials

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


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 .

Download Windows 8

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Windows 8

* Internet access fees may apply while downloading. Your PC must run genuine Windows to install Microsoft Security Essentials.  |  Microsoft Security Essentials Privacy Statement  |  Microsoft Security Essentials License Agreement

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Product info

Get more information on Microsoft Security Essentials.

Protect your PC

Windows 8 and Windows RT include Windows Defender. Learn how it keeps your PC safer.

Help & support

Get help with Microsoft Security Essentials.

Become a partner

Learn how your business can partner with Microsoft on helpful links for your site.