Remove Windows System Defender (Uninstall Guide)

  • October 21, 2009
  • 09:38 PM
  • Read 45,191 times

What is Windows System Defender?

Windows System Defender is a rogue anti-spyware program that uses fake malware files and false scan detections to trick you into thinking that you are infected. When installed, Windows System Defender will be configured to start automatically when Windows boots. The installer will also create numerous files on your computer that will then be detected as malware when the program scans your computer. If you try to remove these supposed infections with Windows System Defender, though, it will state that you first need to purchase the program before it will do so. This tactic of creating fake malware files that will then be detected by the rogue program is a common one used by rogues to trick you into thinking you are infected.

  • Windows System Defender screen shot
  • Scan results
  • Fake Security Warning

While Windows System Defender is running you will be constantly shown fake security alerts and nag screens that are used to further scare you into thinking that you are infected. These alerts will state that infections have been found, your computer is sending private information, or something is attacking your computer. All of these alerts are fake and the same ones are shown on everyone's computer that has the Windows System Defender infection. Therefore, please do not purchase this software based on anything these alerts tell you.

As you can see, this program is a scam and should not be purchased. If you have already purchased it, then please contact your credit card company and dispute the charges. Finally, to remove this infection, please use the removal guide below.

Windows System Defender Removal Options

Self Help Guide

This guide is intended for advanced computer users only. Please ensure your data is backed up before proceeding. If you’re uncomfortable making changes to your computer, consider having a professional help clean your computer or ask in the forums.
  1. Print out these instructions as we will need to close every window that is open later in the fix.

  2. At this point you should download Malwarebytes Anti-Malware, or MBAM, to scan your computer for any any infections or adware that may be present. Please download Malwarebytes from the following location and save it to your desktop:

    Malwarebytes Anti-Malware Download Link (Download page will open in a new window)

  3. Once downloaded, close all programs and Windows on your computer, including this one.

  4. Double-click on the icon on your desktop named mbam-setup.exe. This will start the installation of MBAM onto your computer.

  5. When the installation begins, keep following the prompts in order to continue with the installation process. Do not make any changes to default settings and when the program has finished installing, make sure you leave Launch Malwarebytes Anti-Malware checked. Then click on the Finish button. If MalwareBytes prompts you to reboot, please do not do so.

  6. MBAM will now start and you will be at the main screen as shown below.

    Malwarebytes Anti-Malware

    Please click on the Scan Now button to start the scan. If there is an update available for Malwarebytes it will automatically download and install it before performing the scan.

  7. MBAM will now start scanning your computer for malware. This process can take quite a while, so we suggest you do something else and periodically check on the status of the scan to see when it is finished.

    Malwarebytes Anti-Malware

  8. When MBAM is finished scanning it will display a screen that displays any malware that it has detected. Please note that the infections found may be different than what is shown in the image below due to the guide being updated for newer versions of MBAM.

    MalwareBytes Scan Results

    You should now click on the Remove Selected button to remove all the listed malware. MBAM will now delete all of the files and registry keys and add them to the programs quarantine. When removing the files, MBAM may require a reboot in order to remove some of them. If it displays a message stating that it needs to reboot, please allow it to do so. Once your computer has rebooted, and you are logged in, please continue with the rest of the steps.

  9. You can now exit the MBAM program.

Your computer should now be free of the Windows System Defender program. If your current anti-virus solution let this infection through, you may want to consider purchasing the PRO version of Malwarebytes Anti-Malware to protect against these types of threats in the future.

View Associated Windows System Defender Files

%UserProfile%\Application Data\Windows System Defender c:\Documents and Settings\All Users\Application Data\61a60\WSDDSys c:\Documents and Settings\All Users\Application Data\61a60 c:\Documents and Settings\All Users\Application Data\61a60\WS83b.exe c:\Documents and Settings\All Users\Application Data\61a60\8727.mof c:\Documents and Settings\All Users\Application Data\61a60\mozcrt19.dll c:\Documents and Settings\All Users\Application Data\61a60\sqlite3.dll c:\Documents and Settings\All Users\Application Data\61a60\WSD.ico c:\Documents and Settings\All Users\Application Data\61a60\WSDDSys\ c:\Documents and Settings\All Users\Application Data\WSDDSys c:\Documents and Settings\All Users\Application Data\WSDDSys\wsd.cfg %UserProfile%\Application Data\Microsoft\Internet Explorer\Quick Launch\Windows System Defender.lnk %UserProfile%\Application Data\Windows System Defender\cookies.sqlite %UserProfile%\Desktop\Windows System Defender.lnk %UserProfile%\Recent\ANTIGEN.dll %UserProfile%\Recent\cid.dll %UserProfile%\Recent\ddv.dll %UserProfile%\Recent\eb.sys %UserProfile%\Recent\eb.tmp %UserProfile%\Recent\energy.sys %UserProfile%\Recent\exec.dll %UserProfile%\Recent\exec.tmp %UserProfile%\Recent\FS.exe %UserProfile%\Recent\kernel32.drv %UserProfile%\Recent\PE.drv %UserProfile%\Recent\PE.sys %UserProfile%\Recent\PE.tmp %UserProfile%\Recent\ppal.dll %UserProfile%\Recent\SICKBOY.exe %UserProfile%\Start Menu\Windows System Defender.lnk %UserProfile%\Start Menu\Programs\Windows System Defender.lnk c:\Program Files\Mozilla Firefox\searchplugins\search.xml

View Associated Windows System Defender Registry Information

HKEY_USERS\.DEFAULT\Software\Microsoft\Internet Explorer\SearchScopes "URL" => "{searchTerms}" HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download "RunInvalidSignatures" => "1" HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run "Windows System Defender"

This is a self-help guide. Use at your own risk. can not be held responsible for problems that may occur by using this information. If you would like help with any of these fixes, you can ask for malware removal assistance in our Virus,Trojan,Spyware, and Malware Removal Logs forum.

If you have any questions about this self-help guide then please post those questions in our Am I infected? What do I do? and someone will help you.

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