If you suspect that your device may have malware you should have Microsoft Defender run a scan. Here's how to do that on Windows, Mac, or Android.

One of the key benefits of the Windows Security app is its ability to provide real-time protection. Microsoft Defender Antivirus continuously scans your device for potential threats and takes …

Learn how to use virus and threat protection options in Windows Security to scan your device for threats and view the results.

Learn how to schedule a Windows Defender Antivirus scan at a time and frequency that you choose.

To scan specific files or folders, right-click a file or folder, select Show more options, and then select Scan with Microsoft Defender. When the scan is complete, you'll see the Scan options page letting …

Learn how to install a scanner and then use it to scan pictures and documents in Windows.

Solve problems with detecting and removing malware with Windows Security, including incomplete scans, detection errors, and persistent malware.

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

Oct 14, 2025 · If hardware was changed on a Windows device in order to upgrade to Windows 11 and the system is not recognizing the change in a timely manner, this article explains how to initiate the …

Jan 12, 2007 · Describes how to use the System File Checker tool to troubleshoot missing or corrupted system files in Windows.