Enable or disable Windows Firewall.
Learn the different steps you can take when you are having problems installing Microsoft Security Essentials on your computer.
Learn about antivirus programs, online scanners, and tools that help remove malicious software from your computer.
Learn how to decide whether a website is secure and trusted before you download software or do business online.
Help make your PC more secure by using features like Windows Defender, installing important updates, and backing up your files.