Usually, there is no option to reset the Windows Defender on Windows 10, but you can repair it using the below-mentioned steps.
In general, the Windows Defender Firewall is reset to its default settings for troubleshooting the network connectivity problem. You can reset the Windows Defender Firewall using the Control Panel, Windows Defender settings, Command Prompt, or Windows Firewall with Advanced Security.
Carry out these steps to reset the Windows Defender Firewall through Control Panel:
Carry out these steps to reset the Windows Defender Firewall via Command Prompt:
Using the Windows Firewall with Advanced Security:
There is no such option to reset the Windows built-in security that is Windows Defender. If you face any problems running the Windows Defender, update your Windows version and follow the troubleshooting steps. If you have difficulties in resolving the issues with Windows Defender on Windows 8, contact our technical support by clicking the Call button available on this screen.