About Microsoft Security Essentials
Microsoft Security Essentials provides real-time protection for your home or small business PC that guards against viruses, spyware, and other malicious software.
Microsoft Security Essentials is a free* download from Microsoft that is simple to install, easy to use, and is automatically updated to protect your PC with the latest technology.
Microsoft Security Essentials runs quietly and efficiently in the background so that you are free to use your Windows-based PC the way you want—without interruptions or long computer wait times.
Before installing Microsoft Security Essentials, we recommend that you uninstall other antivirus software already running on your PC. Running more than one antivirus program at the same time can potentially cause conflicts that affect PC performance.
Read the Microsoft Security Essentials Privacy Statement and License Agreement.
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 protect your computers with Microsoft Forefront Endpoint Protection.
* Your PC must run genuine Windows to install Microsoft Security Essentials. Learn more about genuine Windows. Internet access fees may apply.
Download Microsoft Security Essentials
Microsoft Security Essentials is available in many locales and languages. To download Microsoft Security Essentials, choose your preferred locale or language from the list below. Next, choose your operating system to begin the download process. If you’re unsure which operating system you have, please visit Microsoft Support.
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