Microsoft Security Essentials
Microsoft provides a free real-time protection for your home or small business PCs.
Key Features
- Comprehensive malware protection
- Simple, free* download
- Automatic updates
- Easy to use
System Requirements
Since I just extended installed Windows Server 2008 R2 SP1 Eval version on my desktop PC, I would like to install it for test purpose and it is also free!! There is no Windows Server 2008 R2 or 2012 compatibility notes, but I wish to tried.
Here is the download link from Microsoft Security Essetials
Here is the installation steps and it is straight forward as you see.
Microsoft Systems Engineer 