MPSigStub high CPU usage [FIXED]

Madalina Dinita
by Madalina Dinita
Former Managing Editor
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Affiliate Disclosure

  • MPSigStub stands for Microsoft Protection Signature Stub. It is an executable file, a component of Windows that is not considered to be critical. 
  • While it is normal fo the process to cause temporary high CPU usage, certain viruses pretend to have the name MPSigStub.exe so a malware scan is highly recommended. 
  • If other issues make the computer slow, check out the CPU Usage section to learn more about how to deal with them. 
  • We recommend the Windows 10 Fix Guides Hub that collects all relevant guides for solving common issues with Windows 10 components.
MPSigStub high cpu usage

Many users noticed an unusual file on their PC named MPSigStub. While many are concerned about the purpose of this file, in today’s article we’re going to explain to you what is MPSigStub and how to remove it.

Why MPSigStub appears in random folders and how can I remove it?

What it MPSigStub?

MPSigStub.exe is an executable file whose role is to extract downloaded Windows Updates. This file is also associated with Windows Defender, so it’s safe to say that this file is perfectly safe and not malicious.

Bear in mind that sometimes you might have several copies of this file on your PC in several random folders and that is in most cases perfectly normal.

How to fix MPSigStub high CPU usage?

1. Wait for Windows update to finish

windows update MPSigStub

  1. If Windows is installing or downloading updates, make sure to finish the process.
  2. Once the update process is finished, the CPU usage for MPSigStub.exe should drop.

Windows Update causes high CPU usage? Fix that with this simple guide!


2. Run a malware scan

  1. Scan your PC with reliable antivirus software.
  2. If you find any malware, be sure to remove it.

If you’re looking for a fast and reliable antivirus that offers 100% protection, we strongly suggest you try out Bitdefender.

Bitdefender has had a really good reputation along the years and creates good products that help maintain it. Its customer service is also great.

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How do I remove MPSigStub from my PC?

1. Run File Explorer as administrator

  1. Press Windows Key + S and enter file explorer.
    file explorer search results MPSigStub
  2. Right-click File Explorer from the list of results and choose Run as administrator.
  3. After doing that, locate the MPSigStub.exe or its folder and delete it.

2. Use Command Prompt

  1. Press Windows Key + X and choose Command Prompt (Admin) or PowerShell (Admin) from the menu.
    command prompt admin MPSigStub
  2. When Command Prompt starts, navigate to the directory where MPSigStub.exe is located. You need to do that by using the cd command.
  3. Once enter the directory that holds the MPSigStub.exe, type del MPSigStub.exe and press Enter to remove it.
  4. Alternatively, you can delete the entire folder by running rmdir Folder_Name command. Do not use this command if the file is stored in the System32 directory.

There you go, we hope that you found this article helpful and that you understand better MPSigStub actually is and how to remove it on your PC.

The solutions and information presented are also useful in these cases:

  • mpsigstub in random folder – Since the process is related to Windows Updates, it is normal for temporary random folders to be created and find the file in there.
  • mpsigstub virus – Like we said, some existing malware borrows this name. Perform a quick scan to verify if there is a threat or not.

  • mpsigstub avast – Avast, as well as many other antivirus programs, can detect the malware that takes this name.

FAQ: Learn more about MPSigStub

  • How to update mpsigstub.exe?

MPSigStub is a software component of the operating system. It is automatically updated whenever a Windows update includes a new version of the file.

  • What is Mpsigstub.exe location?

Generally, you should find the file somewhere in C:\Windows\System32 folder. If it’s located in a folder in C: we highly recommend performing a malware scan.

  • How to delete mpsigstub.exe?

Once you locate the file by performing a search, you can simply delete the file and enter the admin credentials to perform this operation.

  • What kind of application is mpsigstub?

It’s part of the Windows operating system and its name comes from Microsoft Protection Signature Stub. However, there are certain viruses that mask themselves as mpsigstub.exe so you should scan the file to make sure it is legitimate.

Editor’s Note: This post was originally published in August 2019 and has been since revamped and updated in June 2020 for freshness, accuracy, and comprehensiveness.

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