User Account Control warns you when a program or user attempts to change your computer's settings. Your screen will be temporarily locked until an Administrator can confirm the changes. This helps to protect your computer against malicious software and accidental changes. User Account Control also allows you to decide how often you'll receive these warnings.
Windows Defender provides antivirus and malware protection for your computer. In addition to scanning your computer for potentially harmful applications, Windows Defender provides real-time protection, double-checking each file or application you open without slowing down your computer.
By default, Windows will protect your Internet connection with Windows Firewall. A firewall prevents unauthorized access from external connections and helps protect your network from threats that could harm your computer.
Whenever your computer detects a security threat from a file or application, Windows SmartScreen will notify you with a full-screen warning. Whenever you see this warning screen, you should choose not to open the file or application unless you can verify that it will not damage your computer.