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Windows 11 Pro includes a suite of security features under Windows Security, which continuously protects the PC. Common security alerts include: 1. "Turn on virus protection" or "Real-time protection is off" alerts: These occur after installing or removing a third-party antivirus. To restore protection, open Windows Security, select Turn on in the Virus & threat protection section, and confirm. 2. "Threat found" or "Threat found - action needed" alerts: Indicate that Windows Defender has detected a potential threat. To manage these, open Windows Security, navigate to Virus & threat protection, click on Protection history, select Threat blocked, and use the Actions dropdown to quarantine or allow the file. 3. "Threat quarantined" or "Threat blocked" alerts: A Threat quarantined alert means a file is isolated for review, while a Threat blocked alert indicates successful removal by Defender. Investigate how the threat entered the system. 4. SmartScreen alerts: SmartScreen protects against malicious websites and downloads. If a threat is identified, a red warning page appears. Users can report the site as safe or proceed at their own risk. Blocked downloads can be managed in Edge's Downloads menu. 5. "This app has been blocked" alerts: Smart App Control prevents the installation of untrusted applications. Disabling this feature should only be done if the application is deemed safe. Settings can be found under Windows Security > App & browser control > Smart App Control settings.