Turn Microsoft Defender Firewall on or off
Turning off Microsoft Defender Firewall could make your device (and network, if you have one) more vulnerable to unauthorized access. If there's an app you need to use that's being blocked, you can allow it through the firewall, instead of turning the firewall off.
Automatically diagnose and fix problems with Windows Firewall
Automatically repair Windows Firewall problems, such as Windows fails to start Windows Firewall service (0x5) or Windows remote assistance is not working.
Turn off Defender antivirus protection in Windows Security
Select the Windows Security app from the search results, go to Virus & threat protection, and under Virus & threat protection settings select Manage settings.
Protect my PC from viruses - Microsoft Support
Many viruses and malware try to disable anti-malware software or other security settings when they're installed in order to evade detection. See Prevent changes to security settings with Tamper Protection for information on how to confirm that it's turned on.
How to prevent and remove viruses and other malware
In the Search box, type firewall, and then click Windows Firewall. In the left pane, click Turn Windows Firewall on or off (you may be prompted to enter your administrator password). Under each network location, click Turn on Windows Firewall , and then click OK .
Remove malware from your Windows PC - Microsoft Support
Learn how to remove malware from your PC. Use Microsoft Defender Antivirus in Windows 10 or Windows 11 to scan your PC for malware, viruses, or other threats.
Add an exclusion to Windows Security - Microsoft Support
Under Virus & threat protection settings, select Manage settings, and then under Exclusions, select Add or remove exclusions.
Risks of allowing apps through Windows Defender Firewall
Only allow an app or open a port when you really need to, and follow the steps to remove apps from the list of allowed apps or close ports that you no longer need. Never allow an app that you don't recognize to communicate through the firewall.
How to remove malware or viruses from my Windows 10 PC
Microsoft Defender Antivirus and Windows Firewall are on your device to help protect it from viruses and other malicious software. But if you think they've missed something run Microsoft Defender Offline which can sometimes detect malware that others scanners missed.
Turn Windows Security on or off - Microsoft Support
If you want to use Windows Security, uninstall all of your other antivirus programs and Windows Security will automatically turn on. You may be asked to restart your device. Note : In previous versions of Windows 10, Windows Security is called Windows Defender Security Center.