Good afternoon, I checked here on my computer, but the Antimalware Service Executable is not running together with Avast.
Because as soon as AVAST is installed this Microsoft Defender service is automatically disabled.
What you can do is restart the computer and see if this service will continue to be active or not.
Then come back here to share if everything is “OK” with you.
You probably have Windows Defender turned on for periodic scanning. If you go to Windows Security Center and go to the Virus and threat protection area, you should be able to see something like this
Sorry friend, I’m actually testing on Windows 10. I haven’t checked if Windows 11 has this problem.
I believe someone who has Windows 11 will post if they are having the same problem as yours.
I suggest you leave help on Windows 11 problems to someone that’s using the operating system.
If you need to respond simply state that the user needs to wait till someone with that OS will reply.
Sometimes the best help is no help when you don’t know the answer.