Did you find Windows 10 High CPU usage after installing the latest 2018-09 cumulative update? The system became unresponsive, suddenly antimalware service executable takes all disk, memory and CPU too high up to 100% every minute. Let’s understand, what is Antimalware Service Executable? Why it’s running on background and causing High CPU usage, 100% Disk and Memory usage on Windows 10, 8.1,7.

What is Antimalware Service Executable?

Antimalware Service Executable is a Windows background process that is used by Windows Defender. It’s also known as MsMpEng.exe, that first introduced in Windows 7 and has been around since then in Windows 8, 8.1 and Windows 10. Antimalware Service Executable is responsible for scanning all files on the computer, detecting any dangerous software, installing antivirus definition updates, etc. This process allows Windows Defender to continuously monitor your computer for potential threats and provide real-time protection against malware and cyber attacks.

For example, when you plug in a USB flash drive or an external hard drive, it will monitor those devices for threats. If it finds something that it suspects, it will isolate or eliminate it immediately.

Why Antimalware Service Executable High CPU usage?

The most common reason for Antimalware Service Executable High CPU Usage is the real-time feature which is constantly scanning files, connections and other related applications in real time, which is what it is supposed to be doing (Protect In Real Time). Another reason for High CPU, Memory and Disk usage or system became unresponsive is its Full Scan, which performs a comprehensive check of all files on your computer. Also sometimes corrupted system files, Disk drive failure, Virus malware infection or any windows service stuck running on the background also cause High CPU usage on windows 10.

Should I disable Antimalware Service Executable?

We did not recommend to disable Antimalware Service Executable As this protect your system for ransomware attack which can lock down your files. However, if you feel like its taking too much of resources, you can turn off the real-time protection.

To do this Go to Settings> Update & Security > windows security -> Virus & threat protection > Virus & threat protection settings and disable Real-time protection. It will automatically enable it when it doesn’t find any AntiVirus software installed on your PC.

Turn off Real time protection
Turn off Real-time protection

Turn Off All Scheduled Tasks Of Windows Defender

In several cases, this high usage issue occurs because Windows Defender continuously runs scans, which are managed by scheduled tasks. Fortunately, you can turn them off manually by changing a few options in Windows Task Scheduler.

Press Windows + R, type taskschd.msc and ok to open Task Scheduler window. Here under Task Scheduler (Local) -> Task Scheduler Library -> Microsoft -> Windows -> Windows Defender

Here find a task named “Windows Defender Scheduled Scan” and double-click on it to open the Properties window. first Uncheck Run with highest privilegesNow switch to the Conditions tab and uncheck all four options, Then click OK.

Turn Off All Scheduled Tasks Of Windows Defender
Turn Off All Scheduled Tasks Of Windows Defender

Prevent Windows Defender From Scanning Itself

If you right click on Antimalware Service Executable and choosing the “Open file location” option, it will show you a file named MsMpEng.exe, located C:\Program Files\Windows Defender. And sometimes Windows Defender start scanning this file which causes a high CPU usage issue. Therefore, you can add MsMpEng.exe into the “Excluded files and locations” list to prevent Windows Defender from scanning this file, which will help to prevent high computer resource usage issue from occurring.

To do this, Open settings, Update & Security -> Windows security. Click on Virus & threat protection, then on Virus & threat protection settings.

Virus & threat protection settings
Virus & threat protection settings

Scroll down until “Exclusions” and click Add or remove exclusions. In the next screen, click on Add an exclusion, select Folder and paste the path to Antimalware Service Executable (MsMpEng.exe) in the address bar. Finally, click Open and the folder will now be excluded from the scan. Restart your PC and see if the issue persists.

exclude windows defender scanning
exclude windows defender scanning

Turn Off Windows Defender With Registry Editor

Still the problem not resolved? Is Antimalware Service Executable continuously causing high CPU usage on windows 10? Let’s Disable Windows Defender protection by performing registry tweak below.

Note: Keep in mind that doing so leaves you vulnerable to a range of cyberattacks, so it’s critical that you install an effective anti-malware product on your computer before removing Windows Defender.

Press Windows Key + R, type regedit and ok to open windows registry editor, First backup registry database, then navigate to

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender.

Double click on DisableAntiSpyware, and set its value data to 1.

Note:  If you do not see a registry entry named DisableAntiSpyware, right click in the main Registry Editor pane and select New > DWORD (32 bit) Value. Name this new registry entry DisableAntiSpyware. Double click it and set its value data to 1.

Turn Off Windows Defender With Registry Editor
Turn Off Windows Defender With Registry Editor

Now close the registry editor and restart windows to take effect the changes. Check on next login there is no more high CPU usage, 100% disk usage by Antimalware Service Executable.

Note: After turning off Windows Defender, you need to find a good antivirus or anti-malware program to install on your Windows computer to protect it from harmful apps.

Also sometimes corrupted system files cause high System resource usage or popup different errors on windows 10. We recommend to run system file checker utility that scan and restore missing corrupted system files.

Also, perform clean boot to check and make sure any third party application not causing the 100% CPU usage on windows 10.

Did these solutions help to fix High CPU usage, 100% disk, memory usage by  Antimalware Service Executable process on windows 10? let us know which option worked for you, Also Read 5 solutions to fix Netflix app not working on windows 10.