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Remove “System Blocked for Security Reasons” virus (updated Jan 2020) - Free Guide

removal by Julie Splinters - - | Type: Adware

“System Blocked for Security Reasons” is a fake alert that informs users about a virus infection on their Windows machines

System Blocked for Security ReasonsSystem Blocked for Security Reasons is a fake pop-up message that claims viruses have been detected on the computer

“System Blocked for Security Reasons” virus is a pop-up that tries to trick you into calling alleged Microsoft technicians due to virus infection on your machine. This message can seem like it is legitimate at first, but it does not take long to notice that it is displayed via the browser, such as Google Chrome, Mozilla Firefox, Safari, Internet Explorer, or any other.

Typically, “System Blocked for Security Reasons” tech support scam[1] can be encountered on various shady websites that you get redirected to after clicking on a malicious ad, or if your computer is infected with adware. While in the first case scenario there is nothing to worry about as long as you do not call the self-proclaimed technicians, the latter should be uninstalled from your system, as adware will continue showing you pop-ups, deals, offers, coupons, and other commercial and scam content like “System Blocked for Security Reasons.”

Name System Blocked for Security Reasons
Type Tech support scam, online fraud
Distribution  The scams are delivered to users whose machines have been infected with adware or after they get redirected from a malicious website
Claim  The fake alert claims that users' computers were infected with a dangerous virus, and personal data, system files, banking details, and social network account passwords may have been (or already are) compromised. In order to prevent the damage, users are prompted to call an alleged Microsoft helpline
Main risks  Users who call the fake technicians risk of losing money after paying for obscure services, disclose their personal details or infect their machines with malware as soon as remote access is provided to crooks 
Similar scams Windows Activation Error Code: 0x44578Pornographic virus alert from Microsoft, Your device has been blocked, etc.
Removal  You can get rid of “System Blocked for Security Reasons” notification by simply closing down the browser and never contacting the crooks; however, in case you often encounter ads and are redirected to suspicious sites seemingly out of nowhere, you will have to get rid of adware app that is installed on your system. For that, you can use anti-malware software or follow our manual instructions below
Recovery & optimization In case your computer works slowly, shows errors frequently and suffers from other instability issues, we suggest you scan your machine with PC repair software Reimage Reimage Cleaner Intego – it can fix virus damage and remediate your Windows OS

“System Blocked for Security Reasons” popup is shown in a way that imitates the Windows Blue Screen of Death,[2] or similar legitimate prompts. However, this scam has nothing to do Microsoft or any other legitimate company, as it is a doing of cybercrooks willing to con money out of you. One of the best tactics of doing so is by scaring you that something is very bad is about to happen – like your personal details might get stolen, as well as funds from your banking accounts.

However, “System Blocked for Security Reasons” alert is just a hoax, and, most likely, there are no viruses present on your machine. The main goal of scams like these is to get you on the phone with a tech support scammer, and then they will do the job of convincing you how “infected” your computer is, and how only they can help you. By operating this illegal business, tech support scammers swindled millions of dollars away from unsuspecting users each year,[3] so do not fall a victim and remove “System Blocked for Security Reasons” virus from your browser by closing the tab it is shown in immediately.

There are several versions of the “System Blocked for Security Reasons” virus in the wild, which typically consists of a pop-up, as well as a background message. Here is one of such examples:

***System Alert***
System Blocked for Security Reasons.
Please ensure you do not restart your computer it may lead to Permanent Damage to the System or data loss.

WARNING – Microsoft windows has detected that a porn virus has infected your system and trying to steal pictures, data and social networking passwords. This is a serious hacking issue You may be a victim of online identity theft.
Please Call +1-800-604-9921 for Support or Visit

Terms & Conditions
Copyright 2019 :copyright:Microsoft. All rights reserved.

Call Toll Free +1-800-604-9921 Or Visit

Keep in mind that Microsoft never provides contact phone numbers within its error or warning messages, and has other means of contacting is customers. Besides, detecting malware the way System Blocked for Security Reasons scam claims is virtually impossible, as you need an anti-virus program installed on your machine. Thus, do not call cybercriminals, as they will try to convince you to pay for their fake tech support services, install malware after remote access is given, or make you reveal personal information.

While it is highly unlikely that your computer is infected (and all those scary things about the loss of data, virus attack, personal information disclosure, etc., are just lies), it is worth checking your machine for adware – a type of a potentially unwanted program that focuses on displaying commercial content. Unfortunately, many of such programs also lead users to insecure sites like “System Blocked for Security Reasons.”

System Blocked for Security Reasons scamSystem Blocked for Security Reasons is a scam that seeks to swindle users' money

Adware is typically distributed with the help of software bundles downloaded from third-party freeware sites, so users mostly miss its point of entry. As a result, they are unaware that “System Blocked for Security Reasons” virus alert has appeared on their browsers due to a potentially unwanted program on their machines. Besides, adware might also sometimes act more like malware, preventing its termination, and collecting personal user data.

Therefore, “System Blocked for Security Reasons” virus removal might sometimes cause troubles to users, as it is not immediately clear whether a PUP is related to the browser redirect issues, or it was triggered by a simple miss-click. The best way to know is to perform a full system scan with anti-malware software that could automatically detect suspicious programs and get rid of them for you.

Of course, if you are well familiar with all the apps that should and should not be installed on your machine, you can opt for manual “System Blocked for Security Reasons” adware removal – we provide instructions below for help. Additionally, once you get rid of a PUP, you should also reset the installed browsers and scan the computer with Reimage Reimage Cleaner Intego to fix virus damage, in case you are experiencing issues with your PC.

Adware can get installed on your system without a proper warning

Millions of users download free applications every day, and many choose to use third-parities for that. The practice comes from the time no official web stores existed, such as Microsoft Store, App Store, Google Play, etc. Nowadays, however, there are millions of apps that can be downloaded from the official sources, so there is no need to rely on third parties anymore.

However, if you believe that there is no other software that could replace the one that you want to download from third-parties, you should take several things into consideration – it would help you not to compromise your machine with suspicious software. Here are some tips from security experts:[4]

  • Install reputable anti-malware and keep it updated at all times;
  • Before installing an unknown app from a freeware site, check up on it online – read blogs, forum posts, reviews, etc.;
  • Ensure that you de-select all ticks in the pre-ticked boxes;
  • When the installation wizard shows up, ensure you rely on Advanced/Custom settings instead of Recommended/Quick ones;
  • Read the fine print, as it usually contains information app developers don't want you to know;
  • Watch out for deceptive deals, misplaced buttons, and other tricks – be more attentive in general.

System Blocked for Security Reasons alertSystem Blocked for Security Reasons fake alert is shown within the browser and includes the "Toll free" contact number

“System Blocked for Security Reasons” removal guide

In case the suspicious browser activity is related to adware infection, it is possible to remove System Blocked for Security Reasons virus using two ways. The first option includes manual elimination. Follow the steps provided below carefully to ensure that the malware is rooted out completely.

However, if you are not sure whether adware is involved at all or you don't know which application is the culprit, it is best to proceed with automatic “System Blocked for Security Reasons” virus removal. For that, you should download and install a reputable anti-malware program and perform a full system scan (don't forget to bring security software up to date before that).

Additionally, since adware might change web browser settings without permission, we highly suggest you reset all the installed search tools, including Google Chrome, Internet Explorer, Mozilla Firefox, and others – we provide instructions for that below as well.

You may remove virus damage with a help of Reimage Reimage Cleaner Intego. SpyHunter 5Combo Cleaner and Malwarebytes are recommended to detect potentially unwanted programs and viruses with all their files and registry entries that are related to them.

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Reimage Happiness
Intego Happiness
Compatible with Microsoft Windows Supported versions Compatible with OS X Supported versions
What to do if failed?
If you failed to remove virus damage using Reimage Intego, submit a question to our support team and provide as much details as possible.
Reimage Intego has a free limited scanner. Reimage Intego offers more through scan when you purchase its full version. When free scanner detects issues, you can fix them using free manual repairs or you can decide to purchase the full version in order to fix them automatically.
Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Reimage, try running SpyHunter 5.
Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Intego, try running Combo Cleaner.

To remove “System Blocked for Security Reasons” virus, follow these steps:

Uninstall “System Blocked for Security Reasons” from Windows systems

To get rid of potentially unwanted programs from Windows, you should access Control Panel as follows:

  1. Click Start Control Panel Programs and Features (if you are Windows XP user, click on Add/Remove Programs). Click 'Start -> Control Panel -> Programs and Features' (if you are 'Windows XP' user, click on 'Add/Remove Programs').
  2. If you are Windows 10 / Windows 8 user, then right-click in the lower left corner of the screen. Once Quick Access Menu shows up, select Control Panel and Uninstall a Program. If you are 'Windows 10 / Windows 8' user, then right-click in the lower left corner of the screen. Once 'Quick Access Menu' shows up, select 'Control Panel' and 'Uninstall a Program'.
  3. Uninstall “System Blocked for Security Reasons” and related programs
    Here, look for “System Blocked for Security Reasons” or any other recently installed suspicious programs.
  4. Uninstall them and click OK to save these changes. Right click on each of suspicious entries and select 'Uninstall'

Eliminate “System Blocked for Security Reasons” from Internet Explorer (IE)

In some cases, Internet Explorer might be injected with Browser Helper Objects (BHOs) without would redirect you to malicious sites. Reset IE to stop this behavior:

  1. Remove dangerous add-ons
    Open Internet Explorer, click on the Gear icon (IE menu) on the top right corner of the browser and choose Manage Add-ons. Click on menu icon and select 'Manage add-ons'
  2. You will see a Manage Add-ons window. Here, look for “System Blocked for Security Reasons” and other suspicious plugins. Disable these entries by clicking Disable: Right click on each of malicious entries and select 'Disable'
  3. Change your homepage if it was altered by virus:
    Click on the gear icon (menu) on the top right corner of the browser and select Internet Options. Stay in General tab.
  4. Here, remove malicious URL and enter preferable domain name. Click Apply to save changes. Delete malicious URL, enter your desired domain name and click 'Apply' to save changes
  5. Reset Internet Explorer
    Click on the gear icon (menu) again and select Internet options. Go to Advanced tab.
  6. Here, select Reset.
  7. When in the new window, check Delete personal settings and select Reset again to complete “System Blocked for Security Reasons” removal. Go to 'Advanced' tab and click on 'Reset' button. Now select 'Delete personal settings' and click on 'Reset' button again

Remove “System Blocked for Security Reasons” virus from Microsoft Edge

Reset Microsoft Edge settings (Method 1):

  1. Launch Microsoft Edge app and click More (three dots at the top right corner of the screen).
  2. Click Settings to open more options.
  3. Once Settings window shows up, click Choose what to clear button under Clear browsing data option. Go to Settings and select 'Choose what to clear'
  4. Here, select all what you want to remove and click Clear. Select 'Clear' button
  5. Now you should right-click on the Start button (Windows logo). Here, select Task Manager. Open the start menu and select 'Task Manager'
  6. When in Processes tab, search for Microsoft Edge.
  7. Right-click on it and choose Go to details option. If can’t see Go to details option, click More details and repeat previous steps. Right-click 'Microsoft Edge' and select 'Go to details' Select 'More details' if 'Go to details' option fails to show up
  8. When Details tab shows up, find every entry with Microsoft Edge name in it. Right click on each of them and select End Task to end these entries. Find Microsoft Edge entries and select 'End Task'

Resetting Microsoft Edge browser (Method 2):

If Method 1 failed to help you, you need to use an advanced Edge reset method.

  1. Note: you need to backup your data before using this method.
  2. Find this folder on your computer: C:\Users\%username%\AppData\Local\Packages\Microsoft.MicrosoftEdge_8wekyb3d8bbwe.
  3. Select every entry which is saved on it and right click with your mouse. Then Delete option. Go to Microsoft Edge folder on your computer, right-click every entry and click 'Delete'
  4. Click the Start button (Windows logo) and type in window power in Search my stuff line.
  5. Right-click the Windows PowerShell entry and choose Run as administrator. Find Windows PowerShell, right-click it and select 'Run as administrator'
  6. Once Administrator: Windows PowerShell window shows up, paste this command line after PS C:\WINDOWS\system32> and press Enter:
    Get-AppXPackage -AllUsers -Name Microsoft.MicrosoftEdge | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register $($_.InstallLocation)\AppXManifest.xml -Verbose}
    Copy and paste a required command and press 'Enter'

Once these steps are finished, “System Blocked for Security Reasons” should be removed from your Microsoft Edge browser.

Erase “System Blocked for Security Reasons” from Mozilla Firefox (FF)

  1. Remove dangerous extensions
    Open Mozilla Firefox, click on the menu icon (top right corner) and select Add-ons Extensions. Click on menu icon and select 'Add-ons'
  2. Here, select “System Blocked for Security Reasons” and other questionable plugins. Click Remove to delete these entries. Select 'Extensions' and look for malicious entries. Click 'Remove' to get rid of each of them
  3. Reset Mozilla Firefox
    Click on the Firefox menu on the top left and click on the question mark. Here, choose Troubleshooting Information. Click on menu icon and then on '?'. Select 'Troubleshooting Information'
  4. Now you will see Reset Firefox to its default state message with Reset Firefox button. Click this button for several times and complete “System Blocked for Security Reasons” removal. Click on 'Reset Firefox' button for a couple of times

Delete “System Blocked for Security Reasons” from Google Chrome

You can reset Google Chrome as explained in the guide below:

  1. Delete malicious plugins
    Open Google Chrome, click on the menu icon (top right corner) and select Tools Extensions. Click on menu icon. Select 'Tools' and 'Extensions'
  2. Here, select “System Blocked for Security Reasons” and other malicious plugins and select trash icon to delete these entries. Look for malicious entries and delete each of them by clicking on the Trash bin icon
  3. Click on menu icon again and choose Settings Manage Search engines under the Search section. When in 'Settings', select 'Manage search engines...'
  4. When in Search Engines..., remove malicious search sites. You should leave only Google or your preferred domain name. Click 'X' to remove malicious URLs
  5. Reset Google Chrome
    Click on menu icon on the top right of your Google Chrome and select Settings.
  6. Scroll down to the end of the page and click on Reset browser settings. When in 'Settings', scroll down to 'Reset browser settings' button and click on it
  7. Click Reset to confirm this action and complete “System Blocked for Security Reasons” removal. Click on 'Reset' button to complete your removal

Uninstall “System Blocked for Security Reasons” from Safari

  1. Remove dangerous extensions
    Open Safari web browser and click on Safari in menu at the top left of the screen. Once you do this, select Preferences. Click on 'Safari' and select 'Preferences'
  2. Here, select Extensions and look for “System Blocked for Security Reasons” or other suspicious entries. Click on the Uninstall button to get rid each of them. Go to 'Extensions' and uninstall malicious add-ons
  3. Reset Safari
    Open Safari browser and click on Safari in menu section at the top left of the screen. Here, select Reset Safari.... Click on 'Safari' and select 'Reset Safari...'
  4. Now you will see a detailed dialog window filled with reset options. All of those options are usually checked, but you can specify which of them you want to reset. Click the Reset button to complete “System Blocked for Security Reasons” removal process. Select all options and click on 'Reset' button

Access your website securely from any location

When you work on the domain, site, blog, or different project that requires constant management, content creation, or coding, you may need to connect to the server and content management service more often. It is a hassle when your website is protected from suspicious connections and unauthorized IP addresses.

The best solution for creating a tighter network could be a dedicated/fixed IP address. If you make your IP address static and set to your device, you can connect to the CMS from any location and do not create any additional issues for server or network manager that need to monitor connections and activities. This is how you bypass some of the authentications factors and can remotely use your banking accounts without triggering suspicious with each login. 

VPN software providers like Private Internet Access can help you with such settings and offer the option to control the online reputation and manage projects easily from any part of the world. It is better to clock the access to your website from different IP addresses. So you can keep the project safe and secure when you have the dedicated IP address VPN and protected access to the content management system.

Backup files for the later use, in case of the malware attack

Computer users can suffer various losses due to cyber infections or their own faulty doings. Software issues created by malware or direct data loss due to encryption can lead to problems with your device or permanent damage. When you have proper up-to-date backups, you can easily recover after such an incident and get back to work.

It is crucial to create updates to your backups after any changes on the device, so you can get back to the point you were working on when malware changes anything or issues with the device causes data or performance corruption. Rely on such behavior and make file backup your daily or weekly habit.

When you have the previous version of every important document or project you can avoid frustration and breakdowns. It comes in handy when malware occurs out of nowhere. Use Data Recovery Pro for the system restoring purpose.

About the author

Julie Splinters
Julie Splinters - Malware removal specialist

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  1. BilboBaggins says:
    August 29th, 2016 at 2:05 am

    When did they become so aggressive?

  2. J. Fox says:
    August 29th, 2016 at 2:06 am

    I hate this kind of viruses the most!

  3. Cassandra says:
    August 29th, 2016 at 2:06 am

    For a moment I panicked, but then I scanned the computer and removed this adware. Still, I‘m wondering how I managed to get infected with this cyber parasite.

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