How to remove System Defragmenter

What is System Defragmenter

System Defragmenter is a rogue anti-spyware application that masquerades as a legitimate tool designed to optimize and defragment hard drives. Instead of providing useful functions, this unwanted application infiltrates systems without consent, often bundled with other software or downloaded from dubious sources. Once installed, it bombards users with false security alerts and scan results, claiming to detect various malware threats that do not actually exist. The primary goal of System Defragmenter is to pressure victims into purchasing its so-called “licensed version” to remove the fictitious threats, resulting in financial loss for unsuspecting users. Moreover, this malware can disrupt system performance, leading to slower operations and unwanted pop-ups. Removing System Defragmenter requires a reliable anti-malware tool, as manual uninstallation may not fully eliminate all traces of the program. Users should remain vigilant and rely on trusted security solutions to safeguard their systems against such deceptive applications.

How System Defragmenter infected your computer

System Defragmenter, a rogue anti-spyware program, typically infects computers through deceptive tactics such as bundling with legitimate software, malicious advertisements, or compromised downloads. Once installed, it often masquerades as a legitimate application, bombarding users with fraudulent security alerts and scan results that claim to detect various threats. This barrage of alarming notifications aims to coerce users into purchasing a “licensed version” of the software, promising to remove the non-existent malware. The infection often begins with users unknowingly clicking on suspicious links or installing software from untrustworthy sources. Additionally, the malware may exploit vulnerabilities in outdated systems or software to facilitate its installation without user consent. Once embedded, System Defragmenter can create a range of files and registry entries that further entrench its presence, complicating the removal process and posing ongoing risks to the affected system.

1. Download System Defragmenter Removal Tool
2. Remove/Uninstall System Defragmenter from Control Panel
3. Cannot remove/uninstall System Defragmenter using standard methods
4. Remove System Defragmenter files, folders, and registry keys
5. Block pop-ups promoting System Defragmenter
6. How to protect from threats, like System Defragmenter

Remove System Defragmenter manually for free

Here is a manual step-by-step tutorial for full System Defragmenter removal from your computer. This works 99% and was checked with the latest versions of System Defragmenter installer on operating systems with the latest updates and browser versions.

Remove System Defragmenter from Control Panel

To start removing System Defragmenter, you should remove it using Control Panel. It should uninstall correctly, however, we recommend you to use IObit Uninstaller to clean leftover items after uninstalling. Here are instructions for Windows XP, Windows 7, Windows 8, Windows 10, and Windows 11.

Remove System Defragmenter from Windows XP:

1. Click on Start button.
2. Choose Control Panel.
3. Click Add or Remove Programs.
4. Find System Defragmenter.
5. Click Uninstall.

Remove System Defragmenter from Windows 7:

1. Click Start button.
2. Then go to Control Panel.
3. Click Uninstall a Program.
4. Find System Defragmenter and click Uninstall.

Remove System Defragmenter from Windows 8:

1. Hover mouse pointer to the bottom-right corner to see Menu.
2. Click Search.
3. After that, click Apps.
4. Then Control Panel.
5. Click Uninstall a Program under Programs.
6. Find System Defragmenter, click Uninstall.

Remove System Defragmenter from Windows 10:

There are 2 ways to uninstall System Defragmenter from Windows 10

Way one

1. Click on the Start button.
2. In opened menu, choose Settings.
3. Click on the System tile.
4. Click Apps & features and locate System Defragmenter in the list.
5. Click on it and then click Uninstall button near it.

Way two (classic)

1. Right-click on the Start button.
2. In opened menu, choose Programs and Features.
3. Locate System Defragmenter in the list.
4. Click on it and then click Uninstall button above.

Remove System Defragmenter from Windows 11:

1. Right-click on the Start button.
2. In opened menu, choose Settings.
3. Click on the Apps tab on the left side.
4. Click Apps & features and locate System Defragmenter in the list.
5. Click on 3-dots icon near it and then click Uninstall button near it.
6. Depending on the type of application (Windows Store app or classic Win32 app) it will be removed immediately, or you will need to confirm the action and go through the standard uninstall procedure.

Cannot uninstall System Defragmenter

In some cases, System Defragmenter won’t uninstall and gives you a message, that “You do not have sufficient access to uninstall System Defragmenter. Please, contact your system administrator” when you try to remove it from Control Panel or “Access denied” error when removing System Defragmenter folder and files. This happens because some file or service does not allow you to do it. In this case, I will recommend you to use SpyHunter 5 or Malwarebytes or uninstall System Defragmenter in Safe Mode. To boot in Safe Mode, do the following:

1. Reboot your computer.
2. While it starts booting, press F8 button.
3. This will open Advanced Boot Options menu.
4. Choose Safe Mode and wait until Windows loads.
5. Go to Control Panel > Uninstall a program and remove System Defragmenter.

>> See detailed instructions and video tutorial on how to boot in Safe Mode

Remove files, folders, and registry keys of System Defragmenter

System Defragmenter files:

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System Defragmenter folders:

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System Defragmenter registry keys:

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How to block ads and pop-ups, offering to download System Defragmenter

As System Defragmenter is mostly distributed via special ads and pop-ups promising to fix Windows errors or remove viruses, a good way to avoid the installation of System Defragmenter is to block such ads in browsers. There are a couple of programs that have such functions. We recommend you use AdGuard to remove ads by System Defragmenter from browsers. Download free trial here:

Download AdGuard

Get the best internet security to protect from threats, like System Defragmenter, in the future

One of the most famous and reputable security programs for Windows is SpyHunter 5. Advanced algorithms and large databases help SpyHunter detect and remove various types of threats. Get complete protection from ransomware, adware, spyware, trojans, viruses, and potentially unwanted programs (PUPs), like System Defragmenter, with SpyHunter 5. Download it here:

Download SpyHunter 5