Have you uninstalledAND CLEANED all existing real-time antimalware products BEFORE you installed MSE?If not, you must do so.
Perform these checks:
Verify that you have removed/uninstalled all otherreal-time antimalware products that were ever installed on your PC, including free/trial products that were installed when the PC was purchased (Norton, Symantec, McAfee, TM, AVG, Avast, Avira, Malwarebytes (paid), etc).
Then, use the cleanup tools here:List of anti-malware program cleanup/uninstall toolsIf yours is not listed, go to the manufacturer and get it.
Verify that Windows Defender is uninstalled (if XP), or Disabled (if Vista/W7).
Verify that you are up-to-date with SERVICE PACKS and updates (including .NET and IE).Yes, it can take some time to do this.
Then, restart your PC.
You may need to remove and reinstall MSE as well.If so, you can use the procedure(s) here to uninstall MSE: Uninstalling MSE.
Then, use IE or Firefox, and go towww.microsoft.com/security_essentials and click DOWNLOAD.Do not navigate and download via TOOLBARS.
If the problem persists, submit a support case to Microsoft:https://support.microsoftsecurityessentials.com/?scrx=1
Doc
Computers verified since 1972
Last updated on January 3rd, 2017
In my opinion, Microsoft Security Essentials is a well working free Antivirus solution for individuals and small business. But some times, on different computers, I have discovered that Microsoft Security Essentials (MSE) Antimalware service “MsMpEng.exe” causes high CPU usage with no obvious reason.
After resolving many times this problem, I discovered that the “MsMpEng.exe” high CPU usage problem may happen for various reasons so there is not only one solution to solve it. For example, in the past I have solved the “MsMpEng.exe” high CPU usage problem just by cleaning an infected computer from a nasty virus, or by uninstalling and reinstalling MSE again or by removing an incompatible with MSE security program, etc.
If you want to resolve the MsMpEng.exe high CPU usage problem, then try the following solutions:
How to fix MsMpEng.exe high CPU usage problem.
Attention:
1. Before continuing to resolve the 'MsMpEng.exe' high CPU usage problem, first make sure that you haven't installed another antivirus program on your computer.
2. if you have Windows XP then you must uninstall Microsoft Security Essentials because is no longer supported in Windows XP.
Solution 2: Uninstall & Re-install Microsoft Security Essentials.
Solution 3: Exclude 'MsMpEng.exe' file from scanning.
Solution 4. Re-Schedule MSE scanning time – Disable Microsoft Security Client.
Solution 5: Install another antivirus program on your computer.
Solution 1: Check your computer for Malware.Step 1. Start your computer in Safe Mode with Networking.
In order to check your computer for possible Malware programs running on it, it is better to start your computer in Safe mode with network support. To do that:
Windows 7, Vista & XP users:
Windows 8 & 8.1 users:
Note: In order to boot Windows in “Normal Mode” again, you have to uncheck the “Safe Boot” setting by using the same procedure.
Step 2. Check & terminate possible malicious processes with RogueKiller.
1.Download and save 'RogueKiller' utility on your computer'* (e.g. your Desktop)
Notice*: Download version x86 or X64 according to your operating system's version. To find your operating system's version, 'Right Click' on your computer icon, choose 'Properties' and look at 'System Type' section.
2.Double Click to run RogueKiller.
Service Host: Super Fetch
3. Let the prescan to complete and then press on 'Scan' button to perform a full scan.
3. When the full scan is completed, press the 'Delete' button to remove all malicious items found.
Step 3: Remove Adware programs with AdwCleaner.
1. Download and save “AdwCleaner” utility to your desktop.
2. Close all open programs and Double Click to open ”AdwCleaner” from your desktop.
3. Press “Scan”.
4. When the scan is completed, press “Clean” to remove all the unwanted malicious entries.
4. Press “OK” at “AdwCleaner – Information” and press “OK” again to restart your computer.
5. When your computer restarts, close 'AdwCleaner' information (readme) window and continue to the next step.
Step 4. Remove Malware with Malwarebytes Anti-Malware Free.
Download and install one of the most reliable FREE anti malware programs today to clean your computer from remaining malicious threats. If you want to stay constantly protected from malware threats, existing and future ones, we recommend that you install Malwarebytes Anti-Malware Premium:
Quick download & Installation instructions:
Scan & Clean your computer with Malwarebytes Anti-Malware.
1. Run 'Malwarebytes Anti-Malware' and allow the program to update to its latest version and malicious database if needed.
2. When the update process is completed, press the “Scan Now” button to start scanning your system for malware and unwanted programs.
3. Now wait until Malwarebytes Anti-Malware finishes scanning your computer for malware.
4. When the scan has completed, first press the “Quarantine All” button to remove all threats and then click “Apply Actions”.
5. Wait until Malwarebytes Anti-Malware removes all infections from your system and then restart your computer (if required from the program) to completely remove all active threats.
6. After the system restarts, run Malwarebytes' Anti-Malware again to verify that no other threats remain in your system.
Now check if “MsMpEng.exe” high CPU usage problem is gone, otherwise continue to the rest of this article.
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Solution 2: Uninstall and Re-install Microsoft Security Essentials.Step 1. Uninstall Microsoft Security Essentials from your Control panel.
1. To do this, go to:
2. Double click to open:
3. In the program list, find and Remove (Uninstall) the “Microsoft Security Essentials” application.
Note: If you are having problems removing Microsoft Security Essentials by using the “Add/Remove Programs” feature, then you have to download and run the MSE removal utility. (MS Article ID: 2483120).
4. After removing Microsoft Security Essentials restart your computer.
Note: After the restart, make sure that MSE application is not listed anymore on the installed programs.
Step 2: Reinstall Microsoft Security Essentials.
After the computer restarts, go to Microsoft Security Essentials download site to download and install MSE on your computer again.
Solution 3: Exclude “MsMpEng.exe” from scanning
1. Open Microsoft Security Essentials main application and click “Settings”.
2. Click “Excluded files and locations” on the left pane.
Msmpeng.exe Antimalware Service Executable Windows 8
3. Click “Browse”.
4. Navigate to the following location to select the “MsMpEng.exe” file and press “OK”.
Windows 7, Vista & XP users: C:Program FilesMicrosoft Security ClientMsMpEng.exe
Windows 8 users: C:Program FilesWindows DefenderMsMpEng.exe
5. Press “Add”.
6. Press “Save Settings”.
7.Reboot your computer.
Solution 4. Re-Schedule MSE scanning time or Disable Real-Time Protection.Step 1. Re-Schedule Microsoft Security Essentials Scanning times
One useful feature of MSE is the automatic scanning for virus risks at specific days and hours. So find out at what hours the scanning is performed and set a scan time that is not interrupting your work (e.g. late night hours).
To schedule the Microsoft Security Essentials scanning time:
1. Open Microsoft Security Essentials main application and click “Settings”.
2. Click at “Scheduled Scan” at the left pane.
3. Set a different day & time for the scheduled scan and then press “Save Changes”.
4. Close MSE main application.
Now check if the “MsMpEng.exe” high CPU usage problem still persists. If yes, then temporarily disable the MSE real-time protection to find out if this feature causes the high CPU usage problem.
Step 2. Disable Microsoft Security Essentials Real-time protection.
To disable Microsoft Security Essentials Real-Time protection:
1. Open Microsoft Security Essentials main application and click “Settings”.
2. Click “Real-time protection” at the left pane.
3. Uncheck the box next to “Turn on real-time protection (recommended)” and then press “Save changes”.
4. Close “Microsoft Security Essentials”.
If the “MsMpEng.exe” high CPU usage problem still persists, then continue to the next step and prevent the “Microsoft Security Client” from being loaded at Windows startup.
Step 3. Disable Microsoft Security Client from starting up.
To disable “Microsoft Security Client” from startup:
1. Press “Windows” + “R” keys to load the Run dialog box.
2. Type “msconfig” and press Enter.
3. Click the “Startup” tab.
4.Uncheck the box next to “Microsoft Security Client” entry” and press “OK”
5.Restart your computer.
After the restart, check if your computer is working smoothly and “MsMpEng.exe” high CPU usage problem is gone. Then uninstall Microsoft Security Essentials and install another antivirus program on your computer. (Solution 5).
Solution 5: Install another antivirus program on your computer.
If you are still having problems with Microsoft Security Essentials, then you can try to use another antivirus to protect your computer from risks. To do that:
Step 1. Uninstall Microsoft Security Essentials from your computer.
First of all completely uninstall MSE from your computer by using the instructions of “Solution 2 – Step 1“ of this post.
Step 2. Install a different antivirus program in your computer.
After you uninstall MSE from your computer, proceed to install a different antivirus security program to protect your computer. Suggested free antivirus programs for this task: Avira’s Antivir Free Antivirus, Avast Free Antivirus or AVG Antivirus Free.
If this article was useful for you, please consider supporting us by making a donation. Even $1 can a make a huge difference for us in our effort to continue to help others while keeping this site free:
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The stock answer for this is below. When MSMPENG consumes excessive CPU or memory, it typically indicates a conflict, usually with other security software, though it can be a driver or a process that should not be conflicting that causes MSMPENG to go nuts.
Prior Security Software?
Any security software still installed? A possible reason for this problem is that you have conflicting security software installed fully or partially on the PC. Remove all other security software from the PC. You may need to use a cleanup tool to remove your prior security software: http://social.answers.microsoft.com/Forums/en-US/msestart/thread/407bf6da-c05d-4546-8788-0aa4c25a1f91 If that fails to resolve the problem, open an email support case: To open an email support case, start here: https://support.microsoftsecurityessentials.com/
The following may also assist in isolating the cause of the problem (performed when the problem is happening - that is when memory usage is excessive or CPU usuage by the process is unusually high):
Dump a list of the currently running processes
Vista/Windows 7 –
Type command in the search box and right click command.exe and select “Run as administrator”
Type TASKLIST /V /FO TABLE > t.txtand press enter
A file called t.txt will be written to disk in the folder you ran the command from.
Open the file and copy and paste the results into the forum reply form. If you are working with support , you can send this text file to them.
Run the command FLTMC INSTANCES from an elevated command window (and get the output)
Vista/Windows 7 –
Type command in the search box and right click command.exe and select “Run as administrator”
Type FLTMC INSTANCES and press enter
Copy the results to the clipboard by clicking the icon in the upper left of the window and selecting edit/mark, highlighting the results text, and then edit/copy
Paste the results to a new Notepad text file, directly into the forum reply form or into any text editor
Run pslist from an elevated command window (and get the output)
Vista/Windows 7 –
Type command in the search box and right click command.exe and select “Run as administrator”
Typelive.sysinternals.comtoolspslist -x MsMpEngand press enter
Copy the results to the clipboard by clicking the icon in the upper left of the window and selecting edit/mark, highlighting the results text, and then edit/copy
Paste the results to a new Notepad text file, directly into the forum reply form or into any text editor
-steve
windows 7 8 gigs ram 750gb harddrive, MSE, windows firewall, malwarebytes(on demand scanner)
Has your CPU been at 100% utilization lately? If you went to the Task Manager in Windows and looked at your processes tab, you may have noticed a process called msmpeng.exe eating up all your available CPU.
So what is msmpeng.exe and how can you prevent it from slowing your system down? Well, unlike what you may have read elsewhere, it is not spyware or malware. It’s actually quite ironic because it’s associated with Windows Defender, the anti-virus product from Microsoft.
Windows Defender is an important anti-malware and antivirus program for Windows, which you really shouldn’t turn off unless you have a third-party program installed, in which case, it turns off automatically.
In this article, I’ll go through the different reasons why it could be using up your CPU and what you can do to fix it.
Performing a Scan
If you happened to look at task manager while Windows Defender was performing a scan, it obviously will be taking up a lot of the CPU cycles. Wait until the scan is finished and check your CPU utilization again. Hopefully, it should be back to normal.
Unfortunately, there isn’t any way to change the scheduled scan time for Windows Defender. It should only perform a scan when the computer is idle and outside of active hours. However, if you turn off your computer, then it might perform the scan while you are using it.
Most automatic scans shouldn’t take that long, so if you’re seeing that your computer is running slow for long periods, it could be that Windows Defender is spending a lot of time scanning a directory or a process that doesn’t need to be checked. This brings us to the next possible solution.
Exclusions from Scanning
The best way to figure out what to exclude is to perform a full scan and watch as it goes through all the items on your computer. When you see that it is taking a long time in a particular directory or when scanning a specific process, you can then add that to the exclusions list.
You can do this by going to Virus & Threat Protection, then Virus & Threat Protection settings and finally clicking on Add or remove exclusions.
You can add a File, Folder, File Type or Process to the exclusion list. Once you add the offending items to the list, the amount of time it takes to complete the scan should be cut down significantly.
Turn off Windows Defender
The other option is to simply turn off Windows Defender, which I don’t recommend unless you really must. Another option before permanently disabling Windows Defender is to install a third-party anti-virus program. When you install another anti-virus product, Windows Defender automatically disables itself so that the two programs don’t interfere with each other.
There are a couple of ways you can disable Windows Defender on your PC. In Windows 10, Microsoft really don’t want you to do this, so the only option you have in the Security Center is to disable real-time protection temporarily.
The other way is to edit a registry setting. Open regedit on your PC (Click on Start and type in regedit) and navigate to the following directory:
Create a new DWORD (32-bit) Value called DisableAntiSpyware and give it a decimal value of 1. Go ahead and restart your computer and Windows Defender should be disabled now. You can delete this key or change the value to 0 later on to re-enable Windows Defender.
The second way to permanently disable Windows Defender is to use Group Policy, which will only work on Windows 10 Pro or higher versions. Click on start and type in gpedit.msc and press enter. Navigate to the following folder:
You’ll see an option in the right-hand pane called Turn off Windows Defender Antivirus. Double-click on that and select the Enabled radio button.
Hopefully, you don’t need to disable Windows Defender as it normally does an excellent job of keeping your computer safe from malware and viruses. If you have any issues or nothing above worked for you, let us know in the comments and we’ll try to help. Enjoy!
While investigating the Windows 10 processes in Task Manager you can face with msmpeng.exe or Antimalware Service Executable. Sometimes it causes a very high RAM usage making work on your machine uncomfortable. In this article we will take a closer look on the process, why it can load your CPU and how to fix this.
What is Antimalware Service Executable (MsMpEng.exe)?
Msmpeng.exe is a basic background process of Windows 10 built-in Windows Defender antivirus, it is run by default.
While Antimalware Service Executable is running, the Windows Defender checks all downloads and programs for virus infections, malware etc. It also performs an automatic hard drives scanning periodically.
Why msmpeng.exe Causes High RAM Usage?
Even when working properly the Antimalware Service Executable (or msmpeng.exe) can use a lot of system resources, but in most cases this is happening shortly and only in specific situations.
In case your Windows 10 is functioning properly, the issue with msmpeng.exe can appear in the next situations:
It’s important to mention that in some cases msmpeng.exe can also cause high resources usage because of other issues. In such cases the following tips can help you fix the problem:
Most often msmpeng.exe issue doesn’t mean your computer infected with virus or malware, but you need to check this too. Go to Task manager, right click on MsMpEng.exe process and choose Open file location from context menu. In case it is located in C:Program FilesWindows Defender, most likely everything is OK and your machine is not infected (you can do one more check and take a look at file’s signature -- it must have a Microsoft digital signature).
How to Disable msmpeng.exe?
It’s important to mention that we don’t recommend you to disable msmpeng.exe if it’s only sometimes loads your CPU and everything works fine. But you have an option to disable Antimalware Service Executable -- follow the instructions below:
That’s all! Hope this article helped you to fix the issues with msmpeng.exe (Antimalware Service Executable)!
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