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How to allow blocked file or app on Microsoft Defender Antivirus

If Microsoft Defender Antivirus detected a trusted file or app as a threat, you can allow it on your device with these steps:

Microsoft Defender Antivirus allow blocked threat

On Windows 10, Microsoft Defender Antivirus is the default anti-malware solution to protect your device and data against all sorts of threats, including viruses, spyware, ransomware, rootkits, and other types of malware and hackers.

Although the antivirus offers a robust real-time protection at the level of most sophisticated anti-malware solutions, sometimes, it can detect some files and applications as threats when you know they are not. However, if this ever happens, the default protection built into Windows 10 includes an option to review and allow the file or application on your device. 

In this guide, you’ll learn the steps to allow a file or app recently blocked by Microsoft Defender Antivirus on Windows 10. In addition, we’ll look at the steps to block allowed items in case you need to revert the changes.

Warning: Allowing items flagged as threats by the antivirus can potentially harm your computer and files. It is assumed you know what you are doing and you have previously created a system backup.

How to allow blocked file or app on Microsoft Defender Antivirus

To allow an item that has been blocked by Microsoft Defender, use these steps:

  1. Open Windows Security.

  2. Click on Virus & threat protection.

  3. Under the “Current threats” section, click the Protection history option.

    Protection history option
    Protection history option
  4. Select the file or application you want to allow.

    Quick note: It is recommended to read the details and understand the reason the antivirus blocked the item before allowing it on your device.
  5. Click the “Actions” drop-down menu and select the Allow on device option.

    Allow blocked app
    Allow blocked app

Once you complete the steps, the item will be allowed on your device.

How to block manually allowed file or app on Microsoft Defender Antivirus 

To block a file or application you allowed manually, use these steps:

  1. Open Windows Security.

  2. Click on Virus & threat protection.

  3. Under the “Current threats” section, click the Allowed threats option.

    Allowed threats option
    Allowed threats option
  4. Select the file or application you want to block.

  5. Click the Don’t allow button.

    Blocked allowed threat
    Blocked allowed threat

After you complete the steps, the item will no longer be allowed on your device.