Windows 64-bit operating systems come with a variety of security features to protect users from threats such as malware, viruses, and hackers. One of the key features is Windows Defender, which provides real-time protection against malicious software. Additionally, Windows 64-bit systems include Secure Boot, which helps prevent unauthorized software from loading during the boot process. Another important security feature is Device Guard, which helps protect against malware by only allowing trusted applications to run on the system. With these and other security features, Windows 64-bit operating systems provide users with a robust defense against cyber threats.