Ads by System-Checker

What is System-Checker?

System-Checker is a bogus application that supposedly allows users to monitor various system-related information (CPU, memory, etc.). This functionality may seem legitimate and useful, however, System-Checker is classed as a potentially unwanted program (PUP) or adware.

The developers of this rogue app (MC Software Inc.) employ a deceptive software marketing method called 'bundling' (stealth installation of third party apps together with the chosen software) to install System-Checker on computers without users' permission.

Following installation, System-Checker generates numerous intrusive online advertisements and monitors users' Internet browsing activity.

Intrusive advertisements generated by this rogue application may redirect to bogus websites, thereby exposing your computer to infection. Furthermore, System-Checker records various Internet browsing-related information including operating system, IP addresses, geo-location, websites visited, pages viewed, search/browsing history, and other similar details.

In addition, if System-Checker is installed on a mobile device, it collects the call history, text messages, photos, contacts, IP addresses, hashed IMEI (as a unique identifier number), social media accounts, and social networks.

Be aware that some of this data is likely to be personally identifiable, and therefore, having this application installed on your system can lead to serious privacy issues or even identity theft. For these reasons, you are strongly advised to uninstall the System-Checker application from your system immediately.

There are hundreds of PUPs similar to System-Checker including, for instance, CasinoRewards, Web Shield, and Rapid Media Converter. These offer various useful functions, however, none provide any real value to the user. System-Checker, and other adware, is developed to generate revenue by the display of intrusive online ads and sharing collected data with third parties.

Most adware is distributed using small programs called 'download clients' on freeware download websites such as, download.com, soft32.com, etc. Download clients offer installation of third party applications (described as '100% legitimate and virus-free') to monetize these websites' traffic and free services.

Thus, reckless download and installation of freeware often results in adware or malware infections. This situation can be avoided by closely analysing each step of the free software download procedure and unchecking all third party programs or browser plug-ins included.

Furthermore, installation of downloaded software should be performed using the 'Custom' or 'Additional' options - this will reveal any concealed apps listed for installation and allow you to opt-out. If you have installed System-Checker, the following guidelines will help you to eliminate this adware from your system.

System-Checker adware installer set-up:

Screenshot of System-Checker application:

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Quick menu:

• What is System-Checker?
• STEP 1. Uninstall System-Checker application using Control Panel.
• STEP 2. Remove System-Checker adware from Internet Explorer.
• STEP 3. Remove System-Checker ads from Google Chrome.
• STEP 4. Remove 'Ads by System-Checker' from Mozilla Firefox.
• STEP 5. Remove System-Checker adware from Safari.
• STEP 6. Remove rogue plug-ins from Microsoft Edge.

System-Checker adware removal:

Windows 11 users:

Right-click on the Start icon, select Apps and Features. In the opened window search for the application you want to uninstall, after locating it, click on the three vertical dots and select Uninstall.

Windows 10 users:

Right-click in the lower left corner of the screen, in the Quick Access Menu select Control Panel. In the opened window choose Programs and Features.

Windows 7 users:

Click Start (Windows Logo at the bottom left corner of your desktop), choose Control Panel. Locate Programs and click Uninstall a program.

macOS (OSX) users:

Click Finder, in the opened screen select Applications. Drag the app from the Applications folder to the Trash (located in your Dock), then right click the Trash icon and select Empty Trash.

In the uninstall programs window, look for "System-Checker", select this entry and click "Uninstall" or "Remove".

After uninstalling the potentially unwanted program that causes System-Checker ads, scan your computer for any remaining unwanted components or possible malware infections. To scan your computer, use recommended malware removal software.

Remove System-Checker adware from Internet browsers:

At time of research, System-Checker did not install its browser plug-ins on Internet Explorer, Google Chrome, or Mozilla Firefox, however, it was bundled with other adware. Therefore, you are advised to remove all potentially unwanted browser add-ons from your Internet browsers.

Video showing how to remove potentially unwanted browser add-ons:

Remove malicious add-ons from Internet Explorer:

Click the "gear" icon (at the top right corner of Internet Explorer), select "Manage Add-ons". Look for any recently-installed suspicious browser extensions, select these entries and click "Remove".

Optional method:

If you continue to have problems with removal of the system-checker adware, reset your Internet Explorer settings to default.

Windows XP users: Click Start, click Run, in the opened window type inetcpl.cpl In the opened window click the Advanced tab, then click Reset.

Windows Vista and Windows 7 users: Click the Windows logo, in the start search box type inetcpl.cpl and click enter. In the opened window click the Advanced tab, then click Reset.

Windows 8 users: Open Internet Explorer and click the gear icon. Select Internet Options.

In the opened window, select the Advanced tab.

Click the Reset button.

Confirm that you wish to reset Internet Explorer settings to default by clicking the Reset button.

Remove malicious extensions from Google Chrome:

Click the Chrome menu icon (at the top right corner of Google Chrome), select "Tools" and click "Extensions". Locate all recently-installed suspicious browser add-ons, select these entries and click the trash can icon.

Optional method:

If you continue to have problems with removal of the system-checker adware, reset your Google Chrome browser settings. Click the Chrome menu icon  (at the top right corner of Google Chrome) and select Settings. Scroll down to the bottom of the screen. Click the Advanced… link.

After scrolling to the bottom of the screen, click the Reset (Restore settings to their original defaults) button.

In the opened window, confirm that you wish to reset Google Chrome settings to default by clicking the Reset button.

Remove malicious plugins from Mozilla Firefox:

Click the Firefox menu (at the top right corner of the main window), select "Add-ons". Click "Extensions", in the opened window, remove all recently-installed suspicious browser plug-ins.

Optional method:

Computer users who have problems with system-checker adware removal can reset their Mozilla Firefox settings.

Open Mozilla Firefox, at the top right corner of the main window, click the Firefox menu, in the opened menu, click Help.

Select Troubleshooting Information.

In the opened window, click the Refresh Firefox button.

In the opened window, confirm that you wish to reset Mozilla Firefox settings to default by clicking the Refresh Firefox button.

Remove malicious extensions from Safari:

Make sure your Safari browser is active, click Safari menu, and select Preferences....

In the opened window click Extensions, locate any recently installed suspicious extension, select it and click Uninstall.

Optional method:

Make sure your Safari browser is active and click on Safari menu. From the drop down menu select Clear History and Website Data...

In the opened window select all history and click the Clear History button.

Remove malicious extensions from Microsoft Edge:

Click the Edge menu icon  (at the upper-right corner of Microsoft Edge), select "Extensions". Locate all recently-installed suspicious browser add-ons and click "Remove" below their names.

Optional method:

If you continue to have problems with removal of the system-checker adware, reset your Microsoft Edge browser settings. Click the Edge menu icon  (at the top right corner of Microsoft Edge) and select Settings.

In the opened settings menu select Reset settings.

Select Restore settings to their default values. In the opened window, confirm that you wish to reset Microsoft Edge settings to default by clicking the Reset button.

• If this did not help, follow these alternative instructions explaining how to reset the Microsoft Edge browser.

Summary:

Commonly, adware or potentially unwanted applications infiltrate Internet browsers through free software downloads. Note that the safest source for downloading free software is via developers' websites only. To avoid installation of adware, be very attentive when downloading and installing free software. When installing previously-downloaded free programs, choose the custom or advanced installation options – this step will reveal any potentially unwanted applications listed for installation together with your chosen free program.

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