Learn how to use the System File Checker tool (SFC.exe) to scan and restore Windows system files that are not working or causing crashes. Follow the steps to run SFC.exe, view the scan results, and manually replace the corrupted files if needed.

Learn how to use the Program Install and Uninstall troubleshooter to fix corrupted registry keys, prevent programs from being installed or removed, and access the product code. The troubleshooter runs on Windows 10, 8.1, 8, and 7.

Learn how to diagnose and fix errors in your Outlook mail profile that might prevent you from receiving email. Follow the steps for Outlook 2016 or use the Microsoft Support and Recovery Assistant tool.

Learn how to use the Windows Security Troubleshooter to diagnose and repair Windows security problems by turning on UAC, DEP, Windows Firewall, and other features. Download the troubleshooter and run it on the affected computer or a flash drive or a CD.

Learn how to use Microsoft Defender Antivirus to scan and remove malware from your PC. Follow the steps to run an offline scan, view the results, and take action on the detected threats.

Learn how to use Microsoft Defender to check your device for malware on Windows, Android, or Mac. Find out the signs of infection, the types of scans, and how to run Microsoft Defender Offline for a deeper scan.

Download and run the Windows Firewall Troubleshooter to automatically diagnose and repair common issues with Windows Firewall. The troubleshooter works for Windows 7, 8, 8.1 and 10 in any language.

Learn how to install Microsoft Defender on your Android, iOS, Mac, and Windows devices to protect yourself from threats. Find out how to set up web protection, anti-malware protection, and share your security status with family organizers.

Microsoft Defender offers anti-malware only on Windows, Mac, and Android devices. Learn how to use its real-time and quick scans, how to deal with malware if found, and how to protect yourself from phishing and other threats.

Microsoft Defender is the app that comes with Microsoft 365 subscriptions and offers anti-malware, web protection, and identity theft monitoring. Learn how to install, use, and share it with your family on Windows, Mac, Android, and iOS devices.