Zentom System Guard

Also Known As: Zentom System Guard Rogue
Damage level: High

What is Zentom System Guard?

Zentom System Guard is a fake computer program that attempts to sell you a non existent full version. This program is distributed through Trojans and your computer could become infected by downloading fake Flash Player updates or you could have been tricked into downloading fake video codecs.

The Internet is flooded with misleading websites that proliferate fake computer programs and you should express great caution when downloading anything from unknown sources. Zentom System Guard is propagated via a Trojan, which downloads a fake Windows update after infecting your computer.

You will be encouraged to install this update, and rather than a genuine Windows security update, your computer will be infected with Zentom System Guard.  You should not buy this software, it is useless - merely imitating the process of scanning your computer, and then displaying fake results.

This action is performed to scare you into believing that your PC has various problems.

Zentom System Guard rogue program

Zentom System Guard mimics the detection of many infected files on your PC, and therefore, you should not trust this program. Do not manually delete files identified as spyware, as you could damage your operating system and be unable to boot your computer.

As soon as you notice Zentom System Guard on your computer, you should use this step-by-step removal guide to remove it as soon as possible.

The following fake security warning pop-ups will be displayed to scare you into believing that your PC is infected with various spyware and malware:

"Trojan.Spy threat has been detected. This threat module advertises websites with explicit content. Be advised of such content being possibly illegal. Please click the button below to locate and remove this threat now."

"Warning! Attack detected! Zentom System Guard has detected that somebody is trying to steal Your private data remotely via Trojan.Win32.Generic!BT. Transfer of your private data via the internet will start in: 10 seconds. We strongly recommend you to block attack immediately."

"Zentom System Guard - Hacker attack detected. Your computer is subjected to a hacker attack. Zentom System Guard has detected that somebody is trying to transfer your private data via the internet. We strongly recommend you to block attack immediately."

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Quick menu:

Automatic Zentom System Guard virus removal:

Before downloading removal tool: enter the Zentom System Guard registration key in the registration window. Click the "unlock full version" banner at the bottom-left side of main program window and enter this key:


Entering this key will not remove the infection, but will allow some Windows features previously disabled by the infection, and thus making removal of Zentom System Guard  easier. By entering the registration key, you will not have to pay money, however, the program will behave as if you have paid and will change its state to "registered".

Some spyware infections may block the downloading of spyware removers. If you cannot download it using the default location, try one of the alternative download locations below:

  • Location 1 (the file is renamed to "iexplore.exe", since most of spyware does not block this file)
  • Location 2

If installation of the remover fails, please  try downloading the customized installer, which was developed by our technicians to bypass spyware infections. Download customized installer

"Zentom System Guard" virus manual removal

1. Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK.

During your computer starting process press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, then select Safe Mode with Networking from the list.


2. Download HijackThis and save it to your desktop. Some malicious programs are able to block HijackThis, so when you click the download link, in the Save dialog, rename HijackThis.exe to iexplore.exe and only then click the Save button.

After saving the file to your desktop, double click it. In the main HijackThis window click the “Do a system scan only” button. Select the following entry (place a tick at the left of the entry):

O4 - HKCU\..\Run: [.exe] "%AppData%\\.exe"

After selecting the required entry, click "Fix Checked". After this procedure you can close HijackThis and proceed to the next removal step.

3. Download legitimate anti-spyware software to fully remove Zentom System Guard from your computer.

4. After downloading anti-spyware software, install it, update it, and then run a full system scan. Remove all infections found.

If you are unable to remove Zentom System Guard, you can use these manual removal instructions. Use them at your own risk, since if you do not have strong computer knowledge, you could harm your operating system.

Use them only if you are an experienced computer user. (Instructions on how to end processes, remove registry entries...)

End these Zentom System Guard processes:


Remove these Zentom System Guard registry entries:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\Zentom System Guard
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run ".exe"

Delete these Zentom System Guard files:

%StartMenu%\Zentom System Guard.lnk
%StartMenu%\Programs\Zentom System Guard\
%StartMenu%\Programs\Startup\Zentom System Guard.lnk
%StartMenu%\Programs\Zentom System Guard\Uninstall.lnk
%StartMenu%\Programs\Zentom System Guard\Zentom System Guard.lnk
%UserProfile%\Desktop\Zentom System Guard.lnk     
%AppData%\\.exe{jcomments on}
%AppData%\Microsoft\Internet Explorer\Quick Launch\Zentom System Guard.lnk


The fake antivirus programs (also known as "rogue antivirus programs" or "scareware") are applications that tries to lure computer users into paying for their non-existent full versions to remove the supposedly detected security infections (although the computer is actually clean). These bogus programs are created by cyber criminals who design them to look as legitimate antivirus software. Most commonly rogue antivirus programs infiltrate user's computer using poop-up windows or alerts which appear when users surf the Internet. These deceptive messages trick users into downloading a rogue antivirus program on their computers. Other known tactics used to spread scareware include exploit kits, infected email messages, online ad networks, drive-by downloads, or even direct calls to user's offering free support.

A computer that is infected with a fake antivirus program might also have other malware installed on it as rogue antivirus programs often are bundled with Trojans and exploit kits. Noteworthy that additional malware that infiltrates user's operating system remains on victim's computer regardless of whether a payment for a non-existent full version of a fake antivirus program is made. Here are some examples of fake security warning messages that are used in fake antivirus distribution:

Fake pop-up used in rogue antivirus distribution example 1

Fake pop-up used in rogue antivirus distribution example 2

Computer users who are dealing with a rogue security software shouldn't buy it's full version. By paying for a license key of a fake antivirus program users would send their money and banking information to cyber criminals. Users who have already entered their credit card number (or other sensitive information) when asked by such bogus software should inform their credit card company that they have been tricked into buying a rogue security software. Screenshot of a web page used to lure computer users into paying for a non-existent full version of zentom system guard rogue and other rogue antivirus programs:

example of a webpage used to collect payments for fake antivirus programs

To protect your computer from zentom system guard rogue and other rogue antivirus programs users should:

  • Keep their operating system and all of the installed programs up-to-date.
  • Use legitimate antivirus and anti-spyware programs.
  • Use caution when clicking on links in social networking websites and email messages.
  • Don't trust online pop-up messages which state that your computer is infected and offers you to download security software.

Symptoms indicating that your operating system is infected with a fake antivirus program:

  • Intrusive security warning pop-up messages.
  • Alerts asking to upgrade to a paid version of a program to remove the supposedly detected malware.
  • Slow computer performance.
  • Disabled Windows updates.
  • Blocked Task Manager.
  • Blocked Internet browsers or inability to visit legitimate antivirus vendor websites.

If you have additional information on zentom system guard rogue or it's removal please share your knowledge in the comments section below.

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About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

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