Free antivirus, antispyware, and other security tools

Concerned about your computer becoming infected with a virus, spyware, or other malicious software? Who isn't? One quick, easy way that you can help protect your PC is by downloading Microsoft Security Essentials. It provides real-time protection against malicious software, and it's easy to install, simple to use, and free. Learn more about Microsoft Security Essentials, plus discover other free security tools from Microsoft for additional protection.