From Trend Micro:
Trend Micro Worry-Free Business Security Standard is designed for growing companies that require easy-to-use protection for PCs and file servers. It protects against viruses, spyware, spam, phishing attacks and other web threats, identifying and blocking them before they impact your business. This software provides businesses with fast, effective and simple protection, allowing for uninterrupted protection without slowing down your PC. Worry-Free Business Security even blocks emerging threats in the cloud before they reach your business machines.
With the latest release, Worry-Free Business Security provides a near 90% boost in some areas of performance. It also has dramatic improvements on installation times, real time scans from server to client, and startup and shutdown speeds.
Clients: Intel Pentium x86 or compatible; x64: AMD64, Intel EM64T (clock speed varies depending on OS); 256MB; 512MB recommended; clients require 500MB of available disk space Server: Intel Pentium 4 or higher; Smart Scan mode: Intel core 2 Duo or higher recommended; SmartScan mode 1GB; 2GB recommended, Conventional mode (x86): 512MB; 1GB recommended, x64 (Smart and Conventional): 1GB; 2GB recommended, Windows EBS 2008 or SBS 2008 (Smart and Conventional): 4GB; servers require 5GB of available disk space (not including agents)