Hello Peter, It seems like you are referring to the Windows Defender feature in Windows 8.1. Windows Defender is Microsoft's built-in antivirus program that helps protect your computer against viruses, malware, and other security threats. Here are some points to consider regarding Windows Defender in Windows 8.1: 1. Usefulness for Home Users: - Some users consider Windows Defender to be sufficient: Windows Defender, although not as feature-rich as some third-party antivirus software, provides basic protection against common threats and is generally considered suitable for home users who practice safe browsing habits. - Others prefer third-party antivirus software: Some users prefer third-party antivirus solutions for added features, such as advanced malware protection, additional security layers, and customer support. 2. Baseline Checker: - Windows Defender can be seen as a baseline checker, offering essential protection against known threats. It receives regular updates from Microsoft to keep up with the latest malware signatures. 3. Installation and Ease of Use: - Ease of installation: Windows Defender comes pre-installed with Windows 8.1, so you don't need to download or install additional software. - User-friendly interface: It has a simple interface that is easy to use and requires minimal configuration. 4. Performance Impact: - Windows Defender is designed to run in the background without causing significant performance issues on your system, making it a good choice for users looking for basic antivirus protection without sacrificing system performance. In conclusion, installing and using Windows Defender in Windows 8.1 is generally safe, easy to do, and provides a basic level of protection against common threats. However, depending on your preferences and requirements, you may choose to supplement it with a third-party antivirus program for additional features and security. If you have any specific questions or concerns about setting up Windows Defender or its functionality, feel free to ask for more detailed assistance.