Windows Defender as discussed in our previous articles helps you to keep the computer safe and secured. It is an in-built free tool available from Windows 7 Operating System to the latest Windows 10 computers. You can launch the Windows Security from the Settings > Update & Security > Windows Security. Some users reported that, while trying to launch the Windows Security, computer prompting the error “You’ll need a new app to open this windowsdefender. Look for an app in the Microsoft Store.”
As per our research, there are different factors, which may cause this issue to occur in your computer. Possible reasons for the error You’ll ned a new app to open this windowsdefender message are System File Corruption, faulty Anti-Virus, third-party application etc.
If you are facing the issue with the error You’ll Need A New App To Open This WindowsDefender on your computer, you can try the below resolution steps and fix the error. Perform the resolution steps one by one in order and check if the issue gets fix after each resolution step. If the issue remains, you can proceed with the further steps.
How to fix error You’ll Need A New App To Open This WindowsDefender?
Follow the below resolution steps one by one check if the issue gets fix after each resolution step.
Perform Virus Scan:
If the computer is infected with the virus infections, this issue might occur and Windows Security fails to launch. You can try performing the virus scan using the Malwarebytes tool for the one time scan and remove all the detected threats.
Double click on the downloaded file, follow the on-screen instructions and install the application. Perform the virus scan. If the scan detects any errors, remove them and reboot your computer.
After performing the steps from the above link, reboot your computer and try launching Windows Security. If it opens fine, that is great. If the issue remains, you can try performing the further steps.
Run SFC scan to fix You’ll Need A New App To Open This WindowsDefender error:
Sometimes, when some of the Windows files are corrupted or damaged, it needs some attention to fix those damaged files. System File Checker (SFC) scan helps to scan for those files and repair them automatically. Therefore, running SFC scan might help in fixing the Windows Security error on your computer.
To run SFC scan, follow the below steps:
- Click on Windows logo, in the search box type CMD. Right click on Command Prompt and select the option Run as Administrator.
2. In the elevated Command Prompt, type the below command and hit enter.
3. Once you initiate the scan, it will take a while to complete the process and display the result. Recommend you not to close or terminate the scan process.
4. When the scan is completed, close the Command Prompt and reboot your computer.
Check if the Windows Security works fine after the SFC scan. If it continues the same, you can proceed with the further resolution steps.
Perform clean boot:
If any third-party application or a security program causes the issue, you can try performing the clean boot. After disabling a particular program or application if the Windows Security works fine, then it is easy to fix the issue. Refer the below article to perform clean boot.
After disabling any particular security program, if the Windows Security works fine, we can confirm the cause of the issue. In such cases, we suggest you to remove the Anti-Virus program installed in the computer and re install it later. To perform the same, refer the further steps.
Disable / uninstall Anti-Virus program:
An out-dated or corrupted Anti-Virus program causes severe issues in the computer. To fix the issue with the Windows Security program, we suggest you to perform the complete uninstall the Anti-Virus application and check if the issue gets fix.
Refer below links to disable and uninstall Anti-Virus programs in your computer.
If the Windows Security works fine after removing the Anti-Virus application, then it is causing the issue. You can download the updated Anti-Virus file from manufacturer’s website and install it in your computer.
Re-register Windows Security App:
If none of the resolution steps helps you to fix the issue with the Windows Security error, you can try re-registering the Windows Security and see if that helps. To perform the same, follow the below resolution steps.
- Press Windows logo + X keys on the keyboard and select the option Windows PowerShell (Admin). Click on YES or OK when prompted.
2. In the PowerShell window, copy/paste the below command and hit enter.
Add-AppxPackage -Register -DisableDevelopmentMode “C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy\AppXManifest.xml”
3. Wait for a while and let the command to run. Once it is completed, reboot your computer and try launching Windows Security. It should work fine this time.
The above resolution steps helps you to fix the issue with error You’ll Need A New App To Open This WindowsDefender while launching Windows Security program. If you need any further assistance, do comments below.