How to check if Microsoft Defender is enabled in Windows

View the Windows Security section to see if Microsoft Defender is enabled and protecting the system.

Imagine this: You turn on your computer, you check your email, you make an online purchase — and all the while your computer has no protection. Without you knowing it.

This happens more often than you think. In this article you will see 4 easy ways to check if your Windows antivirus is working — without any technical knowledge.

Microsoft Defender is built into every modern Windows computer.

Windows has a built-in protection program called Microsoft DefenderIt works silently in the background and protects your computer from viruses, malicious files, and suspicious programs — without having to buy anything extra.

The problem? Sometimes it turns off on its own and you don't know it. It could have happened after an update, or because you installed another security program, or even for no apparent reason.

⚠️ Important: A computer without active antivirus is like a house with an open door. Regular scanning only takes 2 minutes and can save you from a lot of problems.

Below you will find 4 methods — from the simplest to the most detailed — to check if Microsoft Defender is properly protecting your computer.

🔍 Method 1: Through Windows Settings

The fastest way. Ideal if you have no experience with computers.

1. Press the keys together Win + I on the keyboard (the Win key has the Windows logo)
2. Settings opens. Go to "Privacy and security" (in Windows 11) or "Information and Security" (on Windows 10)
3. Select - Επιλέξτε "Windows Security"
4. Click "Protection from viruses and threats"
5. If you see the message "No action required" in green — you are fine! ✅

💡 Advice: If you see a red or yellow alert, it means something is wrong and needs your attention. See what to do below.

A green check mark in Windows Security means your computer is protected.

🛡️ Method 2: Directly from the main Security window

This method is even shorter — you open the security program directly.

1. Press the button Start (Windows logo)
2. Type Windows security and press Enter
3. In the window that opens, select "Protection from viruses and threats"
4. Check if the "Real-time protection" it says "Active" with a green icon

⚠️ Caution: Yellow icon = insufficient protection. Red icon = protection is disabled. In both cases, immediate action is required.

⚙️ Method 3: Through Task Manager

This method shows you whether Defender is currently "running" in the background on your computer — like checking if a service is open.

1. Press together Ctrl + Shift + Esc to open Task Manager
2. Go to the tab "Services"
3. Search the list for the service by name "WinDefend"
4. In the "Status" column it should say "Executing"

💡 Useful example: Imagine you are checking to see if a guard is in place. If the service is “Running,” the guard is there. If it says “Stopped,” the door is open.

In Task Manager you can see if the Defender service is active

💻 Method 4: For the more adventurous — via PowerShell

This method looks scary but it's very simple! It gives you the sure, detailed answer about the status of Defender.

1. Click Win + X and select "Windows Terminal (Administrator)" ή "PowerShell (Administrator)"
2. Type the following command exactly as it is and press Enter:

Get-MpComputerStatus | Select-Object AMRunningMode, AntivirusEnabled, RealTimeProtectionEnabled

You will see results like these:

True = protection is active ✅

False = protection is deactivated — needs energy ⚠️

💡 Why this command? Compared to the older one Get-MpPreferenceThe Get-MpComputerStatus shows her actual current situation of Defender — not just the settings. It is more reliable for verification.

🔧 Defender is closed — what do I do now?

Don't panic. The most common causes and solutions are very simple:

1️⃣ Do you have another antivirus installed?

This is the most common cause. Programs like Avast, AVG, Norton, Kaspersky, etc. automatically disable Defender to avoid conflicts. If you no longer use this program, uninstall it and Defender will turn on by itself.

2️⃣ Activate manually from Settings

Go: Settings → Windows Security → Virus & threat protection → Manage settings and activate it "Real-time protection".

3️⃣ Activation via PowerShell (if nothing else works)

Open PowerShell as Administrator and run:

Set-MpPreference -DisableRealtimeMonitoring $false

Then check the status again with Method 4 above.

4️⃣ Restart the computer

Sometimes a simple restart is enough to apply the changes and start Defender normally.

5️⃣ Check for pending updates

Go to Settings → Windows Update and install any pending updates. Sometimes an update error can cause Defender to crash.

A few minutes of checking can save you from serious security problems

📋 Summary — what to do each month

• Check if Defender is active (Method 1 or 2)
• Make sure your virus definitions are up to date (Windows Security → Updates)
• Run a quick virus scan from Windows Security
• Check for pending Windows updates
• Make sure you don't have two antiviruses running at the same time

📝 Conclusion

Microsoft Defender is reliable, free, and already installed on your computer. For the vast majority of users, it offers adequate protection — as long as it works.

With the 4 methods we've seen, you can check its status in less than 2 minutes. And if there is a problem, the solutions we've provided address 90% of the cases.

Never leave your computer unprotected — even if it "appears" to be working properly. Regular checks are the best habit for your digital security. 

Last updated: March 2026

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✍️ Evangelos
Its creator LoveForTechnology.net — an independent and trusted source for tech guides, tools, and practical solutions. Each article is based on personal testing, evidence-based research, and care for the average user. Here, technology is presented simply and clearly.

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