in ,

System Defragmenter Virus Removal Guide

Over the last few weeks we have noticed that a lot of people have had their computers hijacked by a real looking program called System Defragmenter, however this is in fact a form of virus/malware which shows fake alerts and tries to scare you into purchasing it.

Luckily BleepingComputer has put together a full removal guide for you, a few tools are needed beforehand, all of which are free, these are Malwarebytes’ Anti-Malware (MBAM) (here) and rKill (here). Also I would suggest downloading CCleaner (here) and if you are a home user AVG Free Edition (here).

If you check out this link and scroll down about halfway to “Automated Removal Instructions” follow the step-by-step instructions, if you have trouble with these steps perhaps start your computer in Safe Mode with networking, you can do this by pressing F8 during boot-up and choosing “Safe Mode with Networking” from the list (more detailed instructions here).

Once in Safe Mode I would firstly install CCleaner and open it, once open click run cleaner and remove unnecessary file build up, once complete follow Bleeping Computer’s instructions, this involves running rKill to stop any dodgy processes from running (right click and run as administrator on Vista/7), installing MBAM, updating to the latest definitions and then running a full system scan, once complete your PC will restart and System Defragmenter should have vanished.

I would then recommend installing AVG Free Edition if you have no antivirus software installed, this should help protect you against future infections.

Did this guide help you get rid of System Defragmenter? if not feel free to ask questions in the comments section.


  • Rick

    Combofix is your friend!

  • Richard P

    This solution worked perfectly for me too. Thanks guys.

  • Ayan

    I have Norton Anti Virus, which was unable to detect the virus. This solution worked perfectly for and all the defragmenter virus has been removed from my computer.

  • Erik A

    I followed the steps taken and thought I was successful: I ran the scan, found some infections, had MBAM remove the infected items, inspected the log file that seemed to confirm successful removal of the System Defragmenter malware. But when after MBAM asked to reboot the computer, System Defragmenter re-appeared. I will try to go through the steps again, and be sure to reboot in safe mode even in the very last step and see if it helps… but not today.


New Dell Laptops For 2011 – Latest XPS Range A Start

Bejeweled 3 PC / Mac: Release Date Confirmed