Remove “System Blocked For Security Reasons” pop-ups [Chrome, Firefox, IE, Edge]

If you turn on your system and your web browser is launched automatically, after that immediately show the annoying “System Blocked For Security Reasons” fake warning, then most probably your computer has become a victim of ‘ad-supported’ software (also known as adware) that usually gets installed as a part of some freeware. Do not be surprised, it happens, especially if you are an active Internet user. But this does not mean that you should reconcile with these unwanted redirects and ads. Perform the step-by-step guide below to clean your computer as soon as possible, as the adware can be a way to infect your PC system with more dangerous malicious software such as viruses and trojans. The guide which follow, I’ll show you how to remove ‘ad-supported’ software and thereby remove “System Blocked For Security Reasons” unwanted ads from your computer forever.

The malicious software from the ‘ad-supported’ software family that changes the settings of browsers usually affects only the Mozilla Firefox, Chrome, IE and MS Edge. However, possible situations, when any other web browsers will be affected too. The ‘ad-supported’ software may change the Target property of a internet browser’s shortcut, so every time you start the web-browser, instead of your home page, you will see the annoying “System Blocked For Security Reasons” advertisements.

The ad-supported software may insert lots of ads directly to the pages that you visit, creating a sense that the advertising links has been added by the creators of the web site. Moreover, a legal ads may be replaced on the fake ads, that will offer to download and install various unnecessary and harmful programs. Moreover, the ad supported software has the ability to collect a lot of personal information about you (your ip address, what is a web page you are viewing now, what you are looking for on the Web, which links you are clicking), which can later transfer to third parties.

We recommend to get rid of the adware, which redirects your internet browser on the “System Blocked For Security Reasons” unwanted web site, as soon as you found this problem, as it can direct you to web-resources which may load other malicious software on your personal computer.

How does “System Blocked For Security Reasons” ads get installed onto PC

Most often, the adware gets on your computer as a part of various free software, as a bonus. Therefore it is very important at the stage of installing programs downloaded from the Internet carefully review the ‘Terms of use’ and the ‘License agreement’, as well as to always choose the Advanced, Custom or Manual setup mode. In this mode, you can turn off all unwanted add-ons, including an ad-supported software, which can be installed along with the desired program.

How to manually remove “System Blocked For Security Reasons” advertisements

This useful removal guide for the “System Blocked For Security Reasons” advertisements. The detailed procedure can be followed by anyone as it really does take you step-by-step. If you follow this process to delete “System Blocked For Security Reasons” pop-up ads let us know how you managed by sending us your comments please.

1. Remove suspicious and unknown software by using Windows Control Panel
2. Disinfect the browser’s shortcuts to remove “System Blocked For Security Reasons” redirect
3. Remove “System Blocked For Security Reasons” ads from Google Chrome
4. Remove “System Blocked For Security Reasons” pop-ups from FF
5. Get rid of “System Blocked For Security Reasons” from Internet Explorer
6. Remove unwanted Scheduled Tasks

Remove suspicious and unknown software by using Windows Control Panel

We recommend that you start the PC system cleaning process by checking the list of installed software and remove all unknown or suspicious applications. This is a very important step, as mentioned above, very often the malicious applications such as adware and browser hijackers may be bundled with free programs. Uninstall the unwanted applications may remove the unwanted ads or browser redirect to unknown or unwanted sites.

It will display the Windows Control Panel as shown on the screen below.

Next, press “Uninstall a program” It will open a list of all applications. Scroll through the all list, and remove any suspicious and unknown programs. To quickly find the latest installed software, we recommend sort programs by date of installation in the Control panel.

Disinfect the browser’s shortcuts to remove “System Blocked For Security Reasons” redirect

Once the adware is started, it can also change the web browser’s shortcuts, adding an argument such as “http://site.address” into the Target field. Due to this, every time you open the web-browser, it will be redirected to an unwanted ads.

To clear the web browser shortcut, right-click to it and select Properties. On the Shortcut tab, locate the Target field. Click inside, you will see a vertical line – arrow pointer, move it (using -> arrow key on your keyboard) to the right as possible. You will see a text that starts with “http://” which has been added here. You need to remove it.

When the argument is removed, click the OK button. You need to clean all shortcuts of all your web-browsers, as they may be infected too.

Remove “System Blocked For Security Reasons” ads from Google Chrome

Reset Chrome settings is a simple way to get rid of the malware and ‘ad-supported’ software, as well as to restore the web browser’s settings that have been replaced by ad-supported software.

1. Now start the Google Chrome and press Menu button (small button in the form of three horizontal stripes).
2. It will display the Chrome main menu. Select “Settings” option.
3. You will see the Google Chrome’s settings page. Scroll down and press “Show advanced settings” link.
4. Scroll down again and press the “Reset settings” button.
5. The Google Chrome will open the reset profile settings page as on the image above.
6. Next, click the “Reset” button.
7. When this process is finished, your web-browser’s settings will be restored to their original defaults. This will reset your startpage, new tab page and default search engine.
8. To learn more, read the post How to reset Google Chrome settings to default.

Remove “System Blocked For Security Reasons” pop-ups from FF

If the Firefox settings have been changed by the ‘ad-supported’ software, then resetting it to the default state can help you to get rid of the reroute onto “System Blocked For Security Reasons” page.

First, run the Firefox and press button. It will display the drop-down menu on the right-part of the web browser. Next, press the Help button () as shown in the figure below.

In the Help menu, select the “Troubleshooting Information” option. Another way to open the “Troubleshooting Information” screen – type “about:support” in the web-browser address bar and press Enter. It will display the “Troubleshooting Information” page as on the image below. In the upper-right corner of this screen, click the “Refresh Firefox” button.

It will open the confirmation prompt, press the “Refresh Firefox” button. The FF will start a task to fix your problems that caused by the adware. Once it is done, click the “Finish” button

Get rid of “System Blocked For Security Reasons” from Internet Explorer

To remove the “System Blocked For Security Reasons” advertisements you need to reset the Internet Explorer to the state, that was when the Windows was installed on your machine.

First, launch the IE, then click ‘gear’ icon . It will open the drop-down menu on the right part of the browser, then press the “Internet Options” as on the image below.

In the “Internet Options” screen, you need to select the “Advanced” tab and click the “Reset” button. The Microsoft Internet Explorer will show the “Reset Internet Explorer settings” dialog box as shown in the following image. Next, press the “Delete personal settings” check box to select it. After that, click the “Reset” button.

When the process is complete, click “Close” button. Close the IE and restart your personal computer for the changes to take effect. This step will help you to restore your internet browser’s settings to default state and disable ‘ad-supported’ extensions.

Remove unwanted Scheduled Tasks

If the unwanted “System Blocked For Security Reasons” web-site opens automatically on Windows startup or at equal time intervals, then you need to check the Task Scheduler Library and delete all the tasks that have been created by malicios application.

Press Windows and R keys on the keyboard together. This opens a prompt that titled as Run. In the text field, type “taskschd.msc” (without the quotes) and press OK. Task Scheduler window opens. In the left-hand side, click “Task Scheduler Library”, as shown on the image below.

In the middle part you will see a list of installed tasks. Select the first task, its properties will be open just below automatically. Next, click the Actions tab. Pay attention to that it launches on your computer. Found something like “explorer.exe http://site.address” or “chrome.exe http://site.address”, then you need delete it. If you are not sure that executes the task, check it through a search engine. If it is a component of the ‘ad-supported’ applications, then this task also should be removed.

Having defined the task that you want to remove, then click on it with the right mouse button and select Delete as shown in the figure below.

Repeat this step, if you have found a few tasks that have been created by malicios program. Once is complete, close the Task Scheduler window.

Remove “System Blocked For Security Reasons” advertisements with Malwarebytes

Remove “System Blocked For Security Reasons” pop-ups manually is difficult and often the ‘ad-supported’ software is not completely removed. Therefore, we recommend you to use the Malwarebytes Free that are completely clean your PC. The Malwarebytes is a reputable malware removal program. It can automatically detect and remove the ‘ad-supported’ software (also known as adware) of the your PC. Moreover, this free program will help you to delete internet browser hijackers, malware and toolbars that your PC system may be infected too. You can follow the few simple steps below to get rid of the “System Blocked For Security Reasons” unwanted advertisements completely.

Download Malwarebytes Free using the link below.

Once downloaded, close all programs and windows on your system. Open a directory in which you saved it. Double-click on the icon that’s named mb3-setup like below.

When the install begins, you will see the “Setup wizard” that will help you install Malwarebytes on your personal computer.

When installation is done, you will see window as shown on the image below.

Now click on the “Scan Now” button to perform a system scan for the adware that causes the reroute to “System Blocked For Security Reasons” page. This procedure can take some time, so please be patient.

When it has finished scanning, make sure all entries have “checkmark” and press “Quarantine Selected” button. The Malwarebytes will begin removing the adware related files, folders, registry keys. Once the disinfection is finished, you may be prompted to reboot the computer.

The following video explains the guide above on how to remove adware with Malwarebytes Anti-malware.

How to block “System Blocked For Security Reasons” pop-ups

To increase your security and protect your system against new annoying advertisements and malicious web-sites, you need to use an application that blocks access to malicious ads and sites. Moreover, the program can block the open of intrusive advertising, that also leads to faster loading of pages and reduce the consumption of web traffic.

1. Download AdGuard program from the following link.
   
   

   Adguard download
   26898 downloads
   Version: 6.4
   Author: © Adguard
   Category: Security tools
   Update: November 15, 2018
   
2. When the download is finished, launch the downloaded file. You will see the “Setup Wizard” window. Follow the prompts.
3. Once the install is finished, click “Skip” to close it and use the default settings, or press “Get Started” to see a quick tutorial that will help you get to know AdGuard better.
4. In most cases, the default settings are enough and you do not need to change anything. Each time, when you start your machine, AdGuard will launch automatically and block pop-up ads, “System Blocked For Security Reasons” redirects, as well as other dangerous or misleading web-pages. For an overview of all the features of the program, or to change its settings you can simply double-click on the AdGuard icon, that is located on your Windows desktop.

If the problem with “System Blocked For Security Reasons” pop-up ads is still remained

If MalwareBytes cannot delete “System Blocked For Security Reasons” pop-up ads, then we suggests to use the AdwCleaner. AdwCleaner is a free removal tool for adware, browser hijackers, PUPs, toolbars.

1. Download AdwCleaner using the link below.
   

   AdwCleaner download
   225628 downloads
   Version: 8.4.1
   Author: Xplode, MalwareBytes
   Category: Security tools
   Update: October 5, 2024
   
2. Double click the AdwCleaner icon. Once the utility is launched the main screen will appear as shown on the image above.
3. Now, click the “Scan” button to begin scanning your personal computer for the ‘ad-supported’ software that generates “System Blocked For Security Reasons” advertisements.
4. When it has finished scanning, AdwCleaner will display a scan report. Review the report and then click “Clean” button. It will open a dialog box, click “OK” button.

The following video explains the step-by-step instructions above on how to get rid of adware with AdwCleaner.

Finish words

Now your PC should be clean of the “System Blocked For Security Reasons” pop-ups. Remove AdwCleaner. We suggest that you keep AdGuard (to help you block unwanted pop-up ads and annoying malicious web pages) and Malwarebytes (to periodically scan your computer for new malware and adware). Make sure that you have all the Critical Updates recommended for Windows OS. Without regular updates you WILL NOT be protected when new dangerous applications and ad-supported software are released.

If you are still having problems while trying to remove “System Blocked For Security Reasons” ads from your machine, then ask for help in our Spyware/Malware removal forum.