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% of CPU.

The Antimalware Service Executable is a process you might see pop-up in Task Manager’s task list now and again, beavering away at … something. While it’s not always obvious what it’s up to, and the ...

Windows comes with a lot of additional baggage, and if your PC isn't equipped to handle the overhead, you'll find your CPU being hogged by hidden Windows services. Not all of these services are ...