Antivirus software does not guarantee complete safety for computers, especially if the software is no longer supported. As software ages, it becomes vulnerable to security risks, and once support ends, new vulnerabilities are not addressed. Microsoft ended support for Windows 10 in October 2025, meaning users will not receive security updates, increasing the risk of exploitation. Users can identify Windows 10 by checking if the Start button has four black squares. Upgrading to Windows 11 may not be possible for older computers due to hardware limitations, and replacing outdated devices is often recommended. Seeking professional advice is advisable if there is uncertainty about the operating system or upgrade options.