How to Fix Antimalware Service Executable High Memory

The Antimalware Service Executable high memory issue happens when the built-in Windows Defender antivirus gets stuck scanning its own files or runs a massive system scan while you are trying to work. This process is a normal part of Windows security, but it can easily overload your system resources. To fix this, you can add the program to the Windows Defender exclusion list, so it stops scanning itself. You can also change the Task Scheduler settings to force the antivirus to run only when your computer is asleep. For a faster computer overall, you can use professional disk management software to clean up junk files and fix bad health sectors to help your system run smoothly.

Why is Antimalware Service Executable Running High Memory?

Your computer uses background programs to keep viruses away from your personal files. Sometimes these security programs work too hard and accidentally freeze your system.

Many users open their Task Manager and ask why Antimalware Service Executable is using high memory in the first place. This program is simply the main background engine for Windows Defender. It constantly checks your files for viruses. Some users mistakenly call it the antiservice malware executable, but it is a core Microsoft security tool, not a virus.

The problem starts when Windows Defender decides to scan every single file on your hard drive at the exact same time as you are playing a game or working. It also has a bad habit of scanning its own program folders repeatedly. This creates an endless loop that causes the Windows 11 Antimalware Service to cause a high CPU error. Your computer is slow, your fans get loud, and your memory usage stays at 100%.

How to Fix Antimalware Service Executable High Memory Usage

You can stop this program from hoarding your system memory by changing a few simple Windows settings. We will walk you through the safest ways to calm the antivirus down.

Method 1: Add the Process to the Exclusion List

The easiest way to lower memory usage is to stop Windows Defender from scanning itself. Adding the program to the exclusion list breaks the endless scanning loop.

This tells the antivirus to ignore its own files. It will still protect your computer from outside threats perfectly fine.

Step 1: Press the Windows key, type Windows Security, and press Enter.

Step 2: Click on Virus & threat protection on the left side of the screen.

Step 3: Scroll down to Virus & threat protection settings and click Manage settings.

Step 4: Scroll down to the Exclusions section and click Add or remove exclusions.

Step 5: Click the Add an exclusion button and choose Process from the drop-down menu.

Step 6: Type exactly MsMpEng.exe into the box and click Add. Restart your computer.

Method 2: Change the Windows Defender Scan Schedule

Windows often tries to run a full virus scan while you are busy using the computer. You can use the Task Scheduler to force these heavy scans to happen only when you are away.

Changing the schedule gives your computer room to breathe during the day. This stops the sudden spikes in high memory usage.

Step 1: Press the Windows key, type Task Scheduler, and press Enter.

Step 2: In the left menu, open the folders in this exact order: Task Scheduler Library > Microsoft > Windows > Windows Defender.

Step 3: In the middle window, double-click the file named Windows Defender Scheduled Scan.

Step 4: A new window will pop up. Click the Conditions tab at the top.

Step 5: Uncheck all the boxes in this tab and click OK. This stops the scan from running randomly while you are using the computer.

Method 3: Turn Off Real-Time Protection Temporarily

If you need all of your computer memory right now for a heavy video edit or a big game, you can pause the antivirus. This is a great short-term fix for immediate speed.

Windows will automatically turn this security feature back on after a short time to keep you safe. You should only use this method if you are not downloading files from the internet.

Step 1: Open the Windows Security app from your Start menu.

Step 2: Click on Virus & threat protection.

Step 3: Click Manage settings under the settings header.

Step 4: Find the Real-time protection switch and turn it to the Off position. Your memory usage will drop immediately.

Method 4: Optimize Your System with AOMEI Partition Software

When Windows Defender scans your computer, it wastes huge amounts of memory reading old junk files and broken hard drive sectors. Cleaning your system with a visual tool makes every virus scan finish much faster.

AOMEI Partition Software is an excellent tool for speeding up a sluggish computer. Instead of letting Windows Defender choke on useless data, you can use the PC Cleaner feature in AOMEI to safely delete junk files and free up space. You can also use the Check Partition tool to find bad health sectors on your hard drive. Fixing these drive errors stops the antivirus from getting stuck during its routine scans.

AOMEI Partition Software

A free and reliable disk partition software that helps you resize partitions, migrate OS, convert disks, and optimize PC efficiently.

 

Download Freeware Windows 11/10/8.1/8/7

Step 1: Download and open AOMEI Partition Software on your computer. You will see a clear map of all your drives.

Step 2: Right-click your main Windows hard drive on the screen and select Check Partition.

Step 3: Choose the option to check for bad sectors on the partition and click OK.

Step 4: Click Start to begin the test. The software will scan your drive and show you exactly where the system is slowing down.

Ending

A slow computer is incredibly annoying, but you do not have to accept bad performance. Adjusting your security settings takes just a few minutes and frees up massive amounts of memory.

The antimalware service executable high memory error is just Windows Defender working a little too hard. By adding the program to your exclusion list and changing its schedule, you can easily take your computer memory back. To keep your system running fast in the future, using a tool like AOMEI Partition Software to clean out junk files and fix drive errors is always a smart choice.

FAQs

1. Can I completely delete the Antimalware Service Executable?

No. This program is a permanent part of the Windows operating system. If you try to force-delete the file, Windows will break, and your computer will be completely open to real viruses. You can only manage its schedule or pause it temporarily.

2. Is Antimalware Service Executable a virus?

No, it is the exact opposite. It is the official Microsoft antivirus program keeping your computer safe. Sometimes actual viruses will disguise themselves with similar names, but if the file is running normally inside your Task Manager, it is the real Windows Defender.

3. Why does my computer fan get so loud when this runs?

Your computer fan speeds up to cool down your hardware. When Windows Defender runs a massive scan, it uses almost all your processor and memory power. This hard work creates a lot of heat inside the computer case, so the fans spin faster to protect your parts from melting.