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System Defender removal

System Defender Removal Software Download

What is System Defender?

System Defender is a rogue anti-spyware that belongs to the Virus Doctor family of rogue programs. It is also relate to Windows System Defender which was released three weeks before it. System Defender reaches user systems via online scammers and advertisers who use social engineering techniques to try and get users to download and install the software. Once installed, System Defender will block important Windows utilities like Task Manager and Registry Editor in an attempt to discourage users from removing System Defender manually. It also creates a number of harmless files on the hard drive, later flagging them as dangerous viruses. System Defender performs regular fake scans of the system and warns the user that there are some serious threats. It also blocks legitimate virus scanners and websites with legitimate scanners. System Defender then proceeds to try and convince the user to buy the ‘full’ version of the software, claiming that the currently installed ‘trial’ version is insufficient to clean the system of the detected ‘threats’. However, the so-called ‘full’ version of System Defender is in no way more capable than the ‘trial’ version to scan or clean your computer.

As System Defender aggressively tries to prevent its removal by blocking Windows utilities, you will have to restart your computer in Safe Mode before you attempt to remove it. The steps needed for manual System Defender removal are outlined below. It is also recommended to use genuine antivirus software such as Spyware Doctor with Antivirus download.

How to Remove System Defender ?

File Removal Procedures

The first step in System Defender removal is to kill the following processes:

  • WS339.exe
  • ppal.exe
  • tjd.exe

Next, it is necessary to unregister the following DLL files which are related to System Defender:

  • mozcrt19.dll
  • tempdoc.dll
  • sqlite3.dll
  • CLSV.dll
  • PE.dll

The next step is to delete the following files and folders from your hard drive:

  • c:\Documents and Settings\All Users\Application Data\117fc
  • c:\Documents and Settings\All Users\Application Data\117fc\WS339.exe
  • c:\Documents and Settings\All Users\Application Data\117fc\WSD.ico
  • 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\System Defender.lnk
  • %UserProfile%\Application Data\System Defender
  • %UserProfile%\Application Data\System Defender\cookies.sqlite
  • %UserProfile%\Application Data\System Defender\Instructions.ini
  • %UserProfile%\Desktop\System Defender.lnk
  • %UserProfile%\Desktop\xp_7a9be\
  • %UserProfile%\Desktop\xp_7a9be\68.mof
  • %UserProfile%\Desktop\xp_7a9be\mozcrt19.dll
  • %UserProfile%\Desktop\xp_7a9be\sqlite3.dll
  • %UserProfile%\Desktop\xp_7a9be\WSDDSys
  • %UserProfile%\Desktop\xp_7a9be\WSDDSys\
  • %UserProfile%\Recent\ANTIGEN.dll
  • %UserProfile%\Recent\ANTIGEN.sys
  • %UserProfile%\Recent\ANTIGEN.tmp
  • %UserProfile%\Recent\cid.dll
  • %UserProfile%\Recent\CLSV.dll
  • %UserProfile%\Recent\ddv.tmp
  • %UserProfile%\Recent\PE.dll
  • %UserProfile%\Recent\PE.drv
  • %UserProfile%\Recent\PE.sys
  • %UserProfile%\Recent\ppal.exe
  • %UserProfile%\Recent\runddlkey.drv
  • %UserProfile%\Recent\std.sys
  • %UserProfile%\Recent\tempdoc.dll
  • %UserProfile%\Recent\tjd.exe
  • %UserProfile%\Recent\tjd.sys
  • %UserProfile%\Start Menu\System Defender.lnk
  • %UserProfile%\Start Menu\Programs\System Defender.lnk
  • c:\Program Files\Mozilla Firefox\searchplugins\search.xml

After deletion of these files and folders has been completed, your file system is safe from System Defender.

Registry Removal Procedures

The final step in System Defender removal is to delete the following keys and settings from the Windows Registry:

  • HKEY_CLASSES_ROOT\CLSID\{3F2BBC05-40DF-11D2-9455-00104BC936FF}
  • HKEY_CLASSES_ROOT\xp_7a9be.DocHostUIHandler
  • HKEY_CURRENT_USER\Software\Classes\Software\Microsoft\Internet Explorer\SearchScopes "URL" ={searchTerms}
  • HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download "RunInvalidSignatures" = "1"
  • HKEY_CLASSES_ROOT\Software\Microsoft\Internet Explorer\SearchScopes "URL" ={searchTerms}
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run "System Defender"

After this step has been completed, you have completely removed System Defender from your computer. However, in order to make sure that no additional malicious software components are still installed it is recommended to conduct a full system scan using Spyware Doctor with Antivirus download as a genuine security product.


Manual System Defender removal is not recommended for inexperienced users of computer systems as any wrong move could damage the integrity of your system. The best way to ensure that System Defender is removed completely and safely is to use a web-based repair service such as


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