Windows Defender can be activated through Windows Security's Firewall & network protection section. The active network must be selected to enable Defender. Defender can be enabled for different networks for home and work environments
PUA stands for Potentially Unwanted Applications, categorized as grayware. Presenoker represents a grey area between malware and legitimate applications. Commonly found in browser hajakets, torrent clients, and adware. Windows Defender flags these programs as PUA:Win32/Presenoker
Antimalware Service Executable (Msmpeng.exe) is Windows Defender's built-in antivirus feature. It performs real-time scanning and background system checks. High usage occurs after Windows updates due to constant scanning
Windows Defender conflicts with third-party antivirus programs. Out-of-sync computer time and date. System configuration errors. Registry Editor changes preventing Defender activation. Disabled Windows Defender service
Windows Defender is now integrated with Windows Security. First try asking administrator about the issue. Check if Windows Security Health Service is running
Windows Defender is a built-in security system for Windows 11. Access Settings through Start menu. Navigate to Privacy & security section. Select Windows Security. Open Virus & threat protection