Windows Defender is now integrated with Windows Security. First try asking administrator about the issue. Check if Windows Security Health Service is running
Uninstall third-party antivirus programs that may interfere with Windows Security. Install available Windows updates for bug fixes and security patches
Windows Firewall allows opening ports through Inbound Rules. Users can choose TCP or UDP protocols and specify port ranges. Port settings include Domain, Private, and Public options
Windows Security is a security tool protecting against internet threats. Many users report Windows Security not opening after Windows 11 upgrade
Antimalware service executable (msmpeng.exe) runs in Windows Security background. It provides real-time malware protection and scans files and programs. Service deletes or quarantines malicious attacks
Windows 11 virus protection issues commonly occur due to conflicts between third-party antivirus and built-in programs. Windows offers built-in security checks but many users face problems with this feature