Windows

How to Scan for Malware in Windows 11

Written by

Richard

Aug 8, 2021 Updated Apr 28, 2026 3 min read

You scan for malware in Windows 11 using Microsoft Defender Antivirus, the free security software built right into the operating system.

Microsoft Defender Antivirus acts as your PC’s primary defense against viruses, ransomware, and other harmful threats, ensuring your system stays clean and secure.

This comprehensive tool offers quick, full, and custom scan options, allowing you to check your system thoroughly. For instance, a quick scan can typically complete in just a few minutes.

Performing regular scans is crucial for maintaining your PC’s health and protecting your personal data from malicious attacks.

⚡ Quick Answer

Scan for malware in Windows 11 by opening Settings, navigating to Privacy & security, then Windows Security. Click Virus & threat protection, then select Quick scan or Scan options for deeper checks.

How to run a scan in 🪟 Windows 11

You can start a scan right from your settings menu.

1. Open your Settings by pressing the Windows key + I or by clicking Start then Settings.

windows 11 start settings

2. Click on Privacy & security on the left side, then select Windows Security.

Windows Security settings in Windows 11 — windows 11 windows security

3. Click the Open Windows Security button.

Opening Windows Security in Windows 11 — windows 11 open windows security 1

4. Check your dashboard. If you see a green checkmark, your computer is protected. If you see a red X, follow the prompts to fix the issue.

Windows 11 device security status is healthy — windows 11 healthy device security

5. Click on Virus & threat protection, then click Protection updates.

Microsoft Defender protection updates section — microsoft defender protection updates

6. Click Check for updates to make sure your security tools have the latest information. %📂%LNK1%%

Checking for updates in Microsoft Defender — microsoft defender check for updates

7. Go back to Virus & threat protection and select Quick scan.

Performing a quick scan with Microsoft Defender — microsoft defender quick scan

Understanding Scan Types

Windows 11 offers different ways to check your PC. A Quick scan checks common areas where threats hide. A Full scan checks every file and program on your hard drive. Use the Microsoft Defender Offline scan if you suspect a stubborn virus that resists normal removal.

How to run an advanced scan

If you want a deeper look at your files, use an advanced scan.

1. Follow the steps above to get to Virus & threat protection.

2. Click on Scan options.

Microsoft Defender scan options displayed — microsoft defender scan options

3. Select your choice and click Scan now.

Initiating a full scan in Microsoft Defender — microsoft defender full scan

Checking Protection History

After a scan, you should verify what was found. Go to Virus & threat protection and click Protection history. Here, you can see if any items were moved to quarantine or if a false positive occurred.

Troubleshooting Failed Scans

If a scan fails, ensure your Windows is fully updated. Check for pending updates in Settings > Windows Update. Also, ensure no other antivirus software is interfering with Microsoft Defender.

How to schedule scans (Requires Admin Privileges)

You can tell your computer to scan itself automatically.

1. Click Start and search for Task Scheduler.

Windows 11 Task Scheduler application interface — windows 11 task scheduler app

2. In the folder list on the left, go to Task Scheduler Library > Microsoft > Windows, then double-click the Windows Defender folder.

Setting up a scheduled scan in Microsoft Defender — microsoft defender scheduled scan

3. Double-click Microsoft Defender Scheduled Scan in the middle window.

4. Go to the Triggers tab and click New.

Properties for Microsoft Defender scheduled scan — microsoft defender scheduled scan properties

5. Set how often you want the scan to run and click OK.

Trigger settings for Microsoft Defender scheduled scan — microsoft defender scheduled scan trigger

Summary

Regularly scanning your computer keeps it safe from malicious software. Use the Quick scan for routine checks and the Advanced scan if you suspect a deeper problem. Always keep your security intelligence updates current and use the Task Scheduler to automate your security. Staying proactive is the best way to keep your data secure.

How long does a full scan take on 🪟 Windows 11?

A full scan can take anywhere from 30 minutes to several hours depending on the number of files and the speed of your hard drive. It is best to run this when you do not need to use your computer for intensive tasks.

Can I use my computer while a malware scan is running?

Yes, you can continue using your computer during a scan. However, you might notice that your system runs a bit slower than usual because the scan uses your computer’s resources to check files in the background. If performance drops significantly, consider waiting until you are finished with your work.

Does 🪟 Windows 11 need third-party antivirus software?

For most everyday users, Microsoft Defender is more than enough. It provides robust, real-time protection that is built directly into the operating system. Unless you have specific professional needs, you do not need to install extra third-party antivirus software, which can sometimes slow down your computer.

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Tags: #Windows 11

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About the Author

Richard

Tech Writer, IT Professional

Richard, a writer for Geek Rewind, is a tech enthusiast who loves breaking down complex IT topics into simple, easy-to-understand ideas. With years of hands-on experience in system administration and enterprise IT operations, he’s developed a knack for offering practical tips and solutions. Richard aims to make technology more accessible and actionable. He's deeply committed to the Geek Rewind community, always ready to answer questions and engage in discussions.

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