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You are here: Home / Guides / How to Permanently Disable Windows Defender: A Step-by-Step Guide

How to Permanently Disable Windows Defender: A Step-by-Step Guide

posted on January 8, 2026

How to Permanently Disable Windows Defender

Disabling Windows Defender can be done by accessing the Windows Security settings and making some changes to the registry. Although this process requires careful attention, it’s doable with a few straightforward steps. You’ll need to navigate through system settings and make changes that will prevent Windows Defender from re-enabling itself. Remember, doing this will leave your computer vulnerable, so weigh the risks before proceeding.

How to Permanently Disable Windows Defender

In this section, we’ll guide you through permanently disabling Windows Defender. Follow these steps closely to ensure you disable it correctly.

Step 1: Open Windows Security Settings

Navigate to your computer’s settings and locate the Update & Security section.

Once you’re in Update & Security, head over to Windows Security. This is where you can view all the defender settings.

Step 2: Access Virus & Threat Protection

Click on Virus & Threat Protection to view current defender settings.

This section shows you if Windows Defender is currently active. You can also manage its settings here.

Step 3: Disable Real-time Protection

Turn off Real-time protection by toggling off the switch.

Disabling real-time protection stops Windows Defender from scanning your files and apps in real-time, but this is only temporary.

Step 4: Open the Registry Editor

Press Win + R, type regedit, and hit Enter to open the Registry Editor.

The Registry Editor is where you will make changes to ensure Windows Defender stays disabled.

Step 5: Modify the Registry Keys

Navigate to HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows Defender and create a new DWORD (32-bit) Value named DisableAntiSpyware. Set its value to 1.

By doing this, you’re instructing the system to keep Windows Defender turned off permanently.

Once you’ve completed these steps, Windows Defender should remain disabled, even after you restart your computer. However, remember this action increases your security risk.

Tips for How to Permanently Disable Windows Defender

  • Consider using third-party antivirus software to protect your system if you disable Windows Defender.
  • Regularly check your system for malware using other tools or services.
  • Keep your operating system and all other software up-to-date to avoid vulnerabilities.
  • Backup your important data regularly to avoid data loss.
  • Understand that disabling Defender means you’ll be responsible for your system’s security.

Frequently Asked Questions

Can I re-enable Windows Defender after disabling it?

Yes, you can re-enable it by deleting the registry key you created or by restoring default settings.

Why would someone want to disable Windows Defender?

Some users prefer alternative antivirus solutions or need to disable it for certain software installations.

Is it safe to disable Windows Defender permanently?

Disabling it increases the risk of malware, so it’s essential to have another security measure in place.

Will disabling Windows Defender improve system performance?

Some users report performance improvements, but this varies and isn’t guaranteed.

Does Windows Defender impact gaming performance?

It might, as real-time scanning can use system resources. Disabling it may improve performance slightly for some users.

Summary

  1. Open Windows Security Settings.
  2. Access Virus & Threat Protection.
  3. Disable Real-time Protection.
  4. Open the Registry Editor.
  5. Modify the Registry Keys.

Conclusion

Disabling Windows Defender permanently is a decision that should not be taken lightly. While it might offer temporary benefits such as increased performance or compatibility with certain software, it also exposes your computer to potential security threats. It’s crucial to ensure you have alternative security measures in place if you choose this path.

Consider using other antivirus programs or regularly scanning your system for vulnerabilities. If you’re not confident in handling these changes, consulting with a technical professional might be wise.

Understanding the implications of this action is key. If you decide to disable Windows Defender, ensure that you’re well-prepared to manage your system’s security by staying informed and proactive. Remember, the digital world is like a jungle, and leaving your system unprotected is like walking through it without a map or compass. Be safe and make informed decisions!

Matthew Burleigh
Matthew Burleigh

Matthew Burleigh has been a freelance writer since the early 2000s. You can find his writing all over the Web, where his content has collectively been read millions of times.

Matthew received his Master’s degree in Computer Science, then spent over a decade as an IT consultant for small businesses before focusing on writing and website creation.

The topics he covers for MasterYourTech.com include iPhones, Microsoft Office, and Google Apps.

You can read his full bio here.

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