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.
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 them with Microsoft System Center 2012 Endpoint Protection.
* Your PC must run genuine Windows to install Microsoft Security Essentials. Internet access fees may apply while downloading.
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