Use Microsoft Security Essentials to guard against viruses, spyware, and other evil software. It provides real-time protection for your home or small business PCs.
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 Forefront Endpoint Protection.
-Comprehensive malware protection
-Simple, free* download
-Easy to use