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.
Learn how to run a Windows Defender scan on Windows 11 with our step-by-step guide. Keep your PC secure by following these simple, clear instructions.
To perform a full virus scan with the Microsoft Defender Antivirus, open Windows Security > Virus & threat protection > Scan options, choose “Full,” and click “Scan now.” You can also use Command Prompt and PowerShell commands to run a full virus scan on your computer.
Here's my step-by-step guide on how to run a complete malware scan using Windows 10 and 11's built-in Windows Security.
1 Select one or more files, folders, or drives you want to scan on your desktop or File Explorer window. You will only be able to select one item in the navigation pane to scan. See threat details will allow you to select what action to take, and click/tap on Start actions to apply.
Microsoft Defender offers three types of scans to meet different security needs: Quick Scan: Scans the most common locations where threats are typically found. Takes 5-15 minutes and is recommended for regular checks. Full Scan: Scans all files and programs on your hard drive.
Open Microsoft Defender. Click on the shield icon in the bottom right corner of the screen. You can also click on the search bar and search for "Windows Security". Click on "Virus & threat protection". Choose Quick scan. This will scan your user directory and startup items for any potential malware. [2]
In the following sections, you’ll learn step-by-step how to run a full virus scan on Windows 11 using Microsoft Defender, ensuring your device remains protected against evolving cyber threats.
Click the Start button, type "Windows Security" into the search bar, and then hit Enter or click "Open." Then, click on "Virus & Threat Protection" to open the Windows Defender Antivirus window. Click "Quick Scan" if you don't have a ton of time to run a scan.
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