DO NOT disable real-time protection for extended periods of time. Since Windows no longer scans your system continues in the background, the Antimalware Service Executable CPU usage will be reduced.Īgain, this is just a temporary fix.
Switch “ Off” the option under “Real-time protection”.Īs soon as you do that, the real-time protection will be disabled. Click “ Manage settings” under “Virus & threat protection settings” on the right page. Search for “ Windows Security” and click on the result to open it. Treat this method only as a temporary fix. Note: I don’t recommend disabling real-time protection completely. Since the Antimalware Service Executable’s high CPU usage is caused by real-time protection, disabling it will instantly solve the issue. If the above method did not work then as a last-ditch effort try disabling the Windows Defender’s real-time protection. This should reduce the overall high CPU usage by MsMpEng.exe process or Antimalware Service Executable. Once added Windows Defender will not scan itself constantly. Select the “ Windows Defender” folder and click the “ Select Folder” button.Īs soon as you click on the Open button, the Windows Defender folder will be added to the exclusion list. Go to “ C:\ProgramData\Microsoft\” folder. Click on the “ Add an exclusion” button. Scroll and click on the “ Add or remove exclusions” link. Click on the “ Manage Settings” link under the “Virus & threat protection settings” section. On the right page, click “ Virus & threat protection“. Press “ Windows Key” to open the Start menu. So there is a good chance it will work for you too. To stop Windows Defender from scanning itself over and over, you can exclude Windows Defender from the usual scan. Personally, this is the method that worked for me. Under certain situations, the real-time malware protection engine tries to scan itself for unusual behavior and causes Antimalware Service Executable to use a lot of system resources. If Windows Defender found any threats, it will remove them automatically.Īfter removing any malware or confirming that your system is not infected, proceed to the below solutions if the problem still exists. So, sit back and wait until the scan finishes. Depending on your system, the full scan can take quite a bit of time to complete. 
Click the “ Scan options” link on the right page.Īs soon as you click the Scan Now button, Windows Defender starts the scanning process. 
Search for “ Windows Security” and open it.
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