Home » EXE-M » What is mstdefrag.exe and How to Remove mstdefrag.exe Virus Safely

Is your computer infected by a rogue software? If so, you may have mstdefrag.exe on your computer. mstdefrag.exe has various distribution ways like:
1.Adult videos in unsecured websites
2.Fake toolbar redirects web browser
3.Spam emails that contain mstdefrag.exe link or attachment
4.Fake torrent files or files on file sharing networks
5.Web pages containing exploits

mstdefrag.exe Information:

  • FileDescription: mstDefrag Application
  • LegalCopyright: Copyright (C) 2005-2009, mst software GmbH.
  • ProductName: mst Defrag
  • ProductVersion: 3,6,0,0
  • Company: mst software GmbH, Germany
  • FileMd5: 06e42be55b1daf70e0b91e0b61734075
  • FileVersion: 3,6,0,6165
  • Memos: mst Defrag GUI
  • Download mstdefrag.exe fix tool
  • 88100884

Description of mstdefrag.exe Virus :

mstdefrag.exe is a dangerous Trojan horse which can cause chaos on the infected computer, all the versions of the Windows OS like XP, Vista, 7 and 8 can be target of this nasty virus process. PC users may suffer the virus infection while installing or cliking infected programs, processes or links, once they activate this mstdefrag.exe virus, the infected PC will be under attack in a short time. Usually the security tools like anti-virus program or firewall may detect the virus infection but most of them are not able to get rid of it because the nasty virus can escape the tracking of anti-virus program by changing the name and position. It is suggested that PC users should remove this virus in a manual way to keep the infected PC safe.

In general, mstdefrag.exe can modify key system settings on the infected computer for its malicious purpose. The infected PC will suffer slow performance after getting this virus infection, which means PC users have to take a long time opening a program or website due to this virus. Some strange processes will be shown on the Windows Task Manager, those processes keep taking high resource of the CPU so that any action on the infected PC will be slow. The virus is able to download other threats from the unsafe site, that is why many infected computers will get other virus infections, browser hijack redirect and even the rogue program will be on the infected PC at the same time. Anyway, the mstdefrag.exe virus is extremely dangerous which needs to be removed completely.

Destructive Actions of mstdefrag.exe:

  • Automatically deletes several essential files and folders
  • Disable security software and interrupts its task
  • Modifies system settings
  • Steals your personal data and leads to identity theft
  • Affects the system badly and degrades its performance
  • Makes the PC slower and unstable
  • Slow down the internet speed
  • Displays various misleading pop ups and messages on the screen
  • Hijack your web browser and redirects it to unsafe sites
  • Infiltrates the Windows registry and makes it corrupted
  • Installed unknown and unwanted icons on the system
  • Unexpectedly closes of the system after every short duration

This Trojan is really a serious threat for the system as it can also crash the system and makes it weird. With the intention of making your PC safe and protected it is very necessary to remove mstdefrag.exe immediately.

Remove mstdefrag.exe from PC


Step 1: Boot up the infected computer, press F8 at the very beginning, choose Safe Mode with Networking and press Enter to get in safe mode with networking.

safe mode with networking

Step 2: Press Ctrl+Alt+Del keys together and stop mstdefrag.exe processes in the Windows Task Manager.

Windows Task Manager

Step 3: Open the Registry Editor, search for and delete these Registry Entries created by mstdefrag.exe.

(Click Start button> click Run > Input regedit into the Run box and click ok)

run window

registry editor

HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\CustomizeSearch=site address
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Search Bar=site address
HKEY_CURRENT_USER\Software\Microsoft\InternetExplorer\LowRegistry\DontShowMeThisDialogAgain
Step 4: Detect and remove mstdefrag.exe associated files listed below:

%CommonStartMenu%\Programs\.lnk
%LocalAppdata %\random Virus\uninstall\Nation Zoom Virus.lnk
%documents and settings%\ all users\application data\suspicious.exe

Method: Automatic Removal with SpyHunter

Step 1: Press the following button to download SpyHunter

Step 2: Save it into your computer and click on the Run choice to install it step by step.
Step 3: Click Finish then you can use it to scan your computer to find out potential threats by pressing Scan computer now!

Step 4: Tick Select all and then Remove to delete all threats.

Useful Automatic removal mstdefrag.exe with SpyHunter from the Infected Computer

You can use the manual removal procedures above step by step to get rid of mstdefrag.exe, but it is quite complicated actually. So, if you are not a computer savvy, I recommend you to solve this problem with removing mstdefrag.exe automatically with SpyHunter.
Step 1: Download Spyhunter antivirus program by clicking the icon below:

Step 2. Install SpyHunter on your computer step by step.
Step 3. After finishing installation,you need to do a full canning with SpyHunter to find out every threats in your computer.After that, you should select every detected threats and remove them all.

Step 4. Reboot your computer and check it again to make sure that mstdefrag.exe is terminated completely

The mstdefrag.exe virus is a risky computer infection that does great harm to worldwide computers. It usually spreads through network and targets the computer with additional computer threats. Actually, the Trojan horse causes a system to have slow performance. As a result, the affected computer is easy to come across system stuck and constant freezes. With this Trojan horse, users will be typically redirected to unwanted web pages when surfing the web. Meanwhile, constant pop-up ads will appear on the computer, annoying users a lot. As the antivirus still gets disabled by the Trojan horse, it won’t take effective to deal with any computer infection properly. In this case, PC users should clean out the Trojan horse in a manual removal way.

mstdefrag.exe is located in:

  • c:\users\c00k\appdata\roaming\simply super software\trojan remover\mstdefrag.exe
  • c:\usbstorage\mstdefrag.exe
  • c:\documents and settings\bui cong nguyen\desktop\revo_uninstaller_pro_2[1].0.5\revo uninstaller pro 2.0.5\revo uninstaller free\mstdefrag.exe

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