Method 3: Add Antimalware Service Executable to Windows Defender Exclusion List There have been reports by users that adding MsMpEng.exe to the exclusion list of Windows Defenders solves the problem.

I just noticed on my mom's computer that some "MsMpEng.exe" process (labeled "Antimalware Service Executable" and located under "C:\\Program Files\\Microsoft Security Client\\") is consuming 100% ...

The Antimalware Service Executable is a program that runs in the background on your Windows 10/11 PC to protect the computer from viruses and other threats. Sometimes it starts to consume too much ...

The Antimalware Service Executable component of Defender (MsMpEng.exe) was acting strange, showing a high CPU usage when Firefox was running at the same time.