Here's how to do that on Windows, Mac, or Android.

Microsoft Defender Offline will load and perform a quick scan of your PC in the Windows Recovery Environment. When the scan completes, your PC automatically restarts. Note: To see the results of the offline scan, open the Windows Security app on your Windows device and select Protection history.

Find out how to scan files and folders in Windows with Windows Security.

Troubleshoots and fixes common issues with security and malware prevention in Windows.

To install the update, use either of the following methods. Automatically install from Windows Update. KB5007651. Manually download the update. Note: Run the installation as an administrator. Learn more about the Windows Security app here.

Microsoft Defender Antivirus continuously scans your device for potential threats and takes immediate action to neutralize them. This proactive approach helps to prevent malware infections and keeps your device running smoothly.

Windows Security, formerly known as Windows Defender Security Center, is an app built into Windows 10 or 11 that helps keep your PC more secure. It includes Microsoft Defender Antivirus, an antivirus tool that helps protect you against viruses, ransomware, and other malware.

Learn how to use a health report in Windows Security to manage your device performance and keep your device secure.

Learn how to use the PC Health Check app to help you improve your device performance.

Get Help has troubleshooters you can run for many common scenarios. These often help resolve issues without the need to contact support. If a troubleshooter is available for your issue, select Run to start that troubleshooter.