Remove “System Alert! Add Extension” pop-up virus (Tutorial) - Simple Removal Guide

Get rid of “System Alert! Add Extension” pop-up from Windows systems

Follow the steps below to find and delete adware program that is responsible for delivering “System Alert! Add Extension.” Make sure that any adware-related entries haven't been left on the system. Then check the list of Chrome's extensions and make sure that any unknown add-ons haven't been installed.

To remove “System Alert! Add Extension” pop-up virus from Windows 10/8  machines, please follow these steps:

1. Enter Control Panel into Windows search box and hit Enter or click on the search result.
2. Under Programs, select Uninstall a program.
3. From the list, find entries related to “System Alert! Add Extension” pop-up virus (or any other recently installed suspicious program).
4. Right-click on the application and select Uninstall.
5. If User Account Control shows up, click Yes.
6. Wait till uninstallation process is complete and click OK.

If you are Windows 7/XP user, proceed with the following instructions:

1. Click on Windows Start > Control Panel located on the right pane (if you are Windows XP user, click on Add/Remove Programs).
2. In Control Panel, select Programs > Uninstall a program.
3. Pick the unwanted application by clicking on it once.
4. At the top, click Uninstall/Change.
5. In the confirmation prompt, pick Yes.
6. Click OK once the removal process is finished.

Eliminate “System Alert! Add Extension” pop-up from Mac OS X system

If your macOS is displaying some infection symptoms, proceed with the following guide:

Remove “System Alert! Add Extension” pop-up virus from Applications folder:

1. From the menu bar, select Go > Applications.
2. In the Applications folder, look for “System Alert! Add Extension” pop-up virus-related entries.
3. Click on the app and drag it to Trash (or right-click and pick Move to Trash)

To fully remove “System Alert! Add Extension” pop-up virus, you need to access Application Support, LaunchAgents, and LaunchDaemons folders and delete relevant files:

1. Select Go > Go to Folder.
2. Enter /Library/Application Support and click Go or press Enter.
3. In the Application Support folder, look for any dubious entries related to “System Alert! Add Extension” pop-up virus and then delete them.
4. Now enter /Library/LaunchAgents and /Library/LaunchDaemons folders the same way and terminate all the “System Alert! Add Extension” pop-up virus-related entries.

Remove “System Alert! Add Extension” pop-up from Internet Explorer (IE)

Remove dangerous add-ons:

1. Open Internet Explorer, click on the Gear icon (IE menu) on the top-right corner of the browser
2. Pick Manage Add-ons.
3. You will see a Manage Add-ons window. Here, look for “System Alert! Add Extension” pop-up virus and other suspicious plugins. Click on these entries and select Disable.

Change your homepage if it was altered:

1. Open IE and click on the Gear icon.
2. Select Internet Options.
3. In the General tab, delete the Home page address and replace it by your preferred one (for example, Google.com).
4. Click Apply and then select OK.

Delete temporary files:

1. Press on the Gear icon and select Internet Options.
2. Under Browsing history, click Delete…
3. Select relevant fields and press Delete.

Reset Internet Explorer:

1. Click on Gear icon > Internet options and select Advanced tab.
2. Select Reset.
3. In the new window, check Delete personal settings and select Reset again to complete “System Alert! Add Extension” pop-up virus removal.

Delete “System Alert! Add Extension” pop-up virus from Microsoft Edge

Delete unwanted extensions from MS Edge:

1. Select Menu (three horizontal dots at the top-right of the browser window) and pick Extensions.
2. From the list, pick the “System Alert! Add Extension” pop-up virus-related extension and click on the Gear icon.
3. Click on Uninstall at the bottom.

Clear cookies and other browser data:

1. Click on the Menu (three horizontal dots at the top-right of the browser window) and select Privacy & security.
2. Under Clear browsing data, pick Choose what to clear.
3. Select everything (apart from passwords, although you might want to include Media licenses as well, if applicable) and click on Clear.

Reset MS Edge if that above steps did not work:

1. Press on Ctrl + Shift + Esc to open Task Manager.
2. Click on More details arrow at the bottom of the window.
3. Select Details tab.
4. Now scroll down and locate every entry with Microsoft Edge name in it. Right-click on each of them and select End Task to stop MS Edge from running.

If this solution failed to help you, you need to use an advanced Edge reset method. Note that you need to backup your data before proceeding.

1. Find the following folder on your computer: C:\\Users\\%username%\\AppData\\Local\\Packages\\Microsoft.MicrosoftEdge_8wekyb3d8bbwe.
2. Press Ctrl + A on your keyboard to select all folders.
3. Right-click on them and pick Delete
4. Now right-click on the Start button and pick Windows PowerShell (Admin).
5. When the new window opens, copy and paste the following command, and then press Enter:

   Get-AppXPackage -AllUsers -Name Microsoft.MicrosoftEdge | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\\AppXManifest.xml” -Verbose

Instructions for Chromium-based Edge

Delete extensions from MS Edge (Chromium):

1. Open Edge and click select Settings > Extensions.
2. Delete unwanted extensions by clicking Remove.

Clear cache and site data:

1. Click on Menu and go to Settings.
2. Select Privacy and services.
3. Under Clear browsing data, pick Choose what to clear.
4. Under Time range, pick All time.
5. Select Clear now.

Reset Chromium-based MS Edge:

1. Click on Menu and select Settings.
2. On the left side, pick Reset settings.
3. Select Restore settings to their default values.
4. Confirm with Reset.

Erase “System Alert! Add Extension” pop-up from Mozilla Firefox (FF)

Remove dangerous extensions:

1. Open Mozilla Firefox browser and click on the Menu (three horizontal lines at the top-right of the window).
2. Select Add-ons.
3. In here, select plugins that are related to “System Alert! Add Extension” pop-up virus and click Remove.

Clear cookies and site data:

1. Click Menu and pick Options.
2. Go to Privacy & Security section.
3. Scroll down to locate Cookies and Site Data.
4. Click on Clear Data…
5. Select Cookies and Site Data, as well as Cached Web Content and press Clear.

In case “System Alert! Add Extension” pop-up virus did not get removed after following the instructions above, reset Mozilla Firefox:

1. Open Mozilla Firefox browser and click the Menu.
2. Go to Help and then choose Troubleshooting Information.
3. Under Give Firefox a tune up section, click on Refresh Firefox…
4. Once the pop-up shows up, confirm the action by pressing on Refresh Firefox – this should complete “System Alert! Add Extension” pop-up virus removal.

Uninstall “System Alert! Add Extension” pop-up from Google Chrome

Open Chrome's extensions. Carefully look through the list. If you find some unknown extensions that you do not remember installing, remove them immediately. There's no doubt that they are related to “System Alert! Add Extension” adware. Finally, reset the browser in order to get rid of tracking cookies and other virus-related components.

Delete malicious extensions from Google Chrome:

1. Open Google Chrome, click on the Menu (three vertical dots at the top-right corner) and select More tools > Extensions.
2. In the newly opened window, you will see all the installed extensions. Uninstall all the suspicious plugins that might be related to “System Alert! Add Extension” pop-up virus by clicking Remove.

Clear cache and web data from Chrome:

1. Click on Menu and pick Settings.
2. Under Privacy and security, select Clear browsing data.
3. Select Browsing history, Cookies and other site data, as well as Cached images and files.
4. Click Clear data.

If the above-methods did not help you, reset Google Chrome to eliminate all the “System Alert! Add Extension” pop-up virus-components:

1. Click on Menu and select Settings.
2. In the Settings, scroll down and click Advanced.
3. Scroll down and locate Reset and clean up section.
4. Now click Restore settings to their original defaults.
5. Confirm with Reset settings to complete “System Alert! Add Extension” pop-up virus removal.

Get rid of “System Alert! Add Extension” pop-up from Safari

Remove unwanted extensions from Safari:

1. Click Safari > Preferences…
2. In the new window, pick Extensions.
3. Select the unwanted extension related to “System Alert! Add Extension” pop-up virus and select Uninstall.

Clear cookies and other website data from Safari:

1. Click Safari > Clear History…
2. From the drop-down menu under Clear, pick all history.
3. Confirm with Clear History.

Reset Safari if the above-mentioned steps did not help you:

1. Click Safari > Preferences…
2. Go to Advanced tab.
3. Tick the Show Develop menu in menu bar.
4. From the menu bar, click Develop, and then select Empty Caches.

After uninstalling this potentially unwanted program (PUP) and fixing each of your web browsers, we recommend you to scan your PC system with a reputable anti-spyware. This will help you to get rid of “System Alert! Add Extension” pop-up registry traces and will also identify related parasites or possible malware infections on your computer. For that you can use our top-rated malware remover: ReimageIntego, SpyHunter 5Combo Cleaner or Malwarebytes.