Der Windows Defender

https://learn.microsoft.com/de-de/defender-endpoint/command-line-arguments-microsoft-defender-antivirus

CMD ausführen als Administrator:

cd "%PROGRAMFILES%\Windows Defender"
MPCMDRUN.exe -RemoveDefinitions -All
MPCMDRUN.exe -SignatureUpdate

CMD ausführen als Administrator:

cd "%PROGRAMFILES%\Windows Defender"
MPCMDRUN.exe -RemoveDefinitions -All
MPCMDRUN.exe -ResetPlatform
MPCMDRUN.exe -SignatureUpdate