Msmpeng.exe is one of the most common problems associated with Windows computer problems. This executable file is actually associated with an anti-virus software called Windows Defender. Chances are your computer is running slow, making a grinding noise, or crashing and that’s when you went into the Task manager and saw the Msmpeng.exe file using up nearly 100% of your system resources.

Obviously Windows Defender is not suppose to use all of your system resources. The best solution is to simply uninstall or deactivate Windows Defender by:

  1. Opening the program folder and click on Options.
  2. Go to Administrator options and uncheck the Use Windows Defender box.
  3. Click Save.

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