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.

Run a malware scan manually Run a quick scan Turn Defender Antivirus real-time protection on or off To learn more about the Windows Security app and all its features, see Windows …

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

You'll be notified immediately if any threats are found. To scan specific files or folders, right-click a file or folder, select Show more options, and then select Scan with Microsoft Defender. When …

What's the difference between a full scan and quick scan? A quick scan looks for viruses and other malware in all the places they are most likely to hide. It’s a good choice when you’re just …

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

Oct 14, 2025 · Learn how to use the PC Health Check app to help you improve your device performance.

Jan 12, 2007 · The sfc /scannow command will scan all protected system files and replace corrupted files with a cached copy. The scan results will be shown after this process is finished.

The health report starts off by showing you the last time a health scan was run. The time displayed should be the current time, since Windows Security runs a scan when you open the …

Search and find your relevant files from your PC and the cloud much faster than with This PC. If you’d rather have File Explorer open to This PC, on the ribbon, select See more > Options > …