Why is the CPU load / usage 100% for MsMpEng.exe and how to fix it?

Murat Düzer October 30, 2012
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MSMPENG.EXE is running at 100% CPU because of MSE. I know that it’s a Windows Defender and or Mcrosoft Security Essentials process.

Please help me fix this. This might be an older system,but it’s the family internet/homework system, and normally it runs like a champ.

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  1. dhanunjayarao chunduri
    November 1, 2012 at 8:20 am

    add the following in exclusion list within Mcrosoft Security Essentials
    C:\Documents and Settings\All Users\Application Data\Microsoft\Microsoft Antimalware
    C:\Documents and Settings\All Users\Application Data\Microsoft\Microsoft Security Essentials
    C:\Program Files\Microsoft Security Essentials
    Open Microsoft Security Essentials, click the Settings tab and select Excluded files & locations, and then use the Add button to select files, folders, or drives.

  2. Jim Chambers
    October 31, 2012 at 3:02 am

    Follow this advice http://helpdeskgeek.com/windows-vista-tips/what-is-msmpeng-exe/. My advice is to turn of Windows Defender and install Malwarebytes.

  3. Dave Parrack
    October 31, 2012 at 12:54 am

    I had a similar problem and this worked for me...

    1. Open Microsoft Security Essentials.
    2. Click Settings tab.
    3. Click Excluded files and locations.
    4. Click on Add button.
    5. Select the path c:\program files\microsoft security essentials\MsMpEng.exe
    6. Click OK.
    7. Click on Save changes.
    8. Close Microsoft Security Essentials.
    9. Restart computer.

    • Douglas Mutay
      November 1, 2012 at 10:03 am

      Good tip !

    • Marian Cimbru
      November 4, 2012 at 7:03 am

      Thanks!

  4. Tarek Ramadan
    October 30, 2012 at 9:22 pm

    disable windows defender

  5. ha14
    October 30, 2012 at 7:10 pm

    add the following in exclusion list within Mcrosoft Security Essentials
    C:\Documents and Settings\All Users\Application Data\Microsoft\Microsoft Antimalware
    C:\Documents and Settings\All Users\Application Data\Microsoft\Microsoft Security Essentials
    C:\Program Files\Microsoft Security Essentials
    Open Microsoft Security Essentials, click the Settings tab and select Excluded files & locations, and then use the Add button to select files, folders, or drives.

    normally Microsoft Security Essentials has windows defender inside, when you install Microsoft Security Essentials the setup will disable Windows Defender.make sure windows defender is OFF, disabled.

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