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Security Defender. How to remove? (Uninstall guide)

removal by Gabriel E. Hall - -   Also known as SecurityDefender | Type: Rogue Antispyware

Security Defender is a rogue anti-spyware program that is closely connected to win32/defmid trojan that usually comes undetected. In addition, after being installed it uses fake scan results and false security alerts as a method to make you think you are infected with viruses. It impersonates Windows Defender which is a legitimate anti-spyware program. The rogue simulates a system scan and reports fake infections. It then prompts to pay for a full version of the program to remove the threats. Actually, it just tries scams you out of your money. If you have paid for the this program already then I suggest you contact your credit card company and dispute the charges. Security Defender is configured to start automatically when you login to Windows. It detects non-existent or harmless files as malware but does not allow you to remove them until you purchase the full version of the program.

While Security Defender is running you will also see many f fake security alerts and warnings on your computer. These warnings will state that your computer is infected or that someone is trying to hack your computer and then suggest you purchase Security Defender to protect yourself. Some of the fake alerts:

Security Defender Firewall Alert
Suspicious activity in your registry system space was detected. Rogue malware detected in your system. Data leaks and system damage are possible. Please use a deep scan option.
Harmful software detected
Security Defender has detected malicious software that may cause crash of your computer. Click Remove All button to remove them now.

Security Defender

External software tries to control variety of your system files. This may lead to breaking of some data in your system. Click here to protect remote access to your PC & delete these programs.

Security Defender

Your system has come under attack of harmful software. Click here to deactivate it.

Remove spyware and other potentially unwanted software

System Defender detected 18 harmful application(s). It is recommended to clean your computer immediately. Click this balloon to fix the problem.

These alerts, like the fake infections, are just another attempt of the program to try and convince you that you are infected. You should ignore anything this program reports to you. If you are infected with Security Defender, please do not purchase it. Instead use the removal guide below to remove this program and related malware manually for free or using our automatic removal tool given below.

UPDATE: There is a new version of Security Defender virus, which is similar to PC Defender Plus. Just like the older variant, this virus is istributed by trojans that can easily be downloaded when downloading unofficial software or simly visiting illegal websites, such as gambling and similar. Once it gets inside the system, it literally bombards its victim with its misleading alerts that announce about spyware, malware or other dangerous viruses detected. Of course, this is done for trying to swindle the money, so Security Defender then suggests to purchase its license and remove infections from the system. Before you pay the money, be aware that all this story is a huge scam, which must be ginored. Here are some of Security Defender's alerts:

System Security Alert!
Vulnerabilities found
Background scan for security breaches has been finished. Serious problems have been detected. Safeguard your system against exploits, malware and viruses right now by activating Proactive Defence.

System Security Alert!
Unknown program is scanning your system registry right now! Identify the theft detected!

Please, ignore them and remove Security Defender. For that, run a full system scan with automated anti-malware program. We recommend using updated Plumbytes Anti-MalwareWebroot SecureAnywhere AntiVirus or Reimage. Note that you may be blocked from launching your anti-malware. To overcome this problem, follow these steps:

1. Restart your PC
2. Press the F8 key a few times.
3. Select Safe Mode with Networking and press Enter.
4. Now download Reimage and run a full system scan. Don't forget to repeat the scan when on normal mode as well.

We might be affiliated with any product we recommend on the site. Full disclosure in our Agreement of Use. By Downloading any provided Anti-spyware software to remove Security Defender you agree to our privacy policy and agreement of use.
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Reimage (remover) Happiness
Reimage (remover) Happiness
Compatible with Microsoft Windows Compatible with OS X
What to do if failed?
If you failed to remove infection using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to uninstall Security Defender. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.

Note: Manual assistance required means that one or all of removers were unable to remove parasite without some manual intervention, please read manual removal instructions below.

More information about this program can be found in Reimage review.
Press mentions on Reimage
Security Defender snapshot
Security DefenderSecurity Defender (2)

Security Defender manual removal:

Kill processes:

Delete registry values:
HKEY_CLASSES_ROOT.exe "(Default)" = ""


HKEY_CURRENT_USERSoftwareClasses.exeshellopencommand "(Default)" = ""%CommonAppData%pcdfdata.exe" /ex "%1" %*"

HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun "pcdfsvc" = "%CommonAppData%pcdfdata.exe /min"

Delete files:
%AllUsersProfile%DesktopSecurity Defender.lnk









%CommonStartMenu%ProgramsSecurity Defender

%CommonStartMenu%ProgramsSecurity DefenderRemove Security Defender.lnk

%CommonStartMenu%ProgramsSecurity DefenderSecurity Defender Help and Support.lnk

%CommonStartMenu%ProgramsSecurity DefenderSecurity Defender.lnk

About the author

Gabriel E. Hall
Gabriel E. Hall - Passionate web researcher

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  • brian

    I cant seem to be able to get into safe mode with windows 8. It is blocking me from doing anything. My anti-virus software wont find it??
    Any suggestions in either getting to safe mode to download a new software?

    • Jim

      Same thing here. Boot to recovery and get cod print
      Set drive to c
      Type “bootrec. Exe /fixboot”
      Type “bootrec.exe /fixmbr”
      Restart, you should now be able to boot in safe mode

  • Ted

    Tour instructions worked perfectly …Malwarebytes was great … Thank you

  • Nancy

    Security Defender has locked me out of Internet Explorer. How do I remove it?

  • Yiddish

    Antivirus Scan is really needed that too if we go with Comodo Product we can attain our desired result.

  • Ivo

    Symantic virus scanner identified the virus and deleted it.

  • Stephen

    I just got “security defender” trojan today. I purchased Spyware doctor, updated it, and ran it twice. It would not detect and remove this thing. Neither would Malwarebytes antimalware software. Not sure where to go next. Im sick of spending money on things that advertise as a fix, and yet do not fix the problem.

  • lynda

    My daughter had that security defender to hit her computer today and we couldnt figure out how to get rid of it. There was no uninstalling it. we ran our malwarebytes spyware program and to our supprize it picked up the virus and removed it from our computer. was recommended to us by Microsoft tech last year and we have used it quit a bit. It is a good program to have and has a free version to download.