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Windows Defender has been turned off


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Hello, 

I'm experiencing an issue with Windows Defender but I unfortunately I also think the problem may be more widespread than that with Windows 10. 

I normally run Malwarebytes Premium along with MSE/Windows Defender but just noticed today that Windows Defender is giving me an error saying that it's been turned off. I did a scan with Malwarebytes as well as ran a scan using ClamWin. Both scans from both programs found no malicious files. I researched ways to turn Defender back on and none of the methods listed got me anywhere. 

I've run sfc /scannow and it comes back saying there were errors but windows was unable to fix some. I tried running DISM with /restorehealth command and it doesn't like the source file. 

Any assistance is appreciated!

Thanks, Coug

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  • Root Admin

Hello @coug

Can you please run the following for me.

 

Please run the following steps and post back the logs as an attachment when ready.

STEP 01

  • If you're already running Malwarebytes 3 then open Malwarebytes and check for updates. Then click on the Scan tab and select Threat Scan and click on Start Scan button.
  • If you don't have Malwarebytes 3 installed yet please download it from here and install it.
  • Once installed then open Malwarebytes and check for updates. Then click on the Scan tab and select Threat Scan and click on Start Scan button.
  • Once the scan is completed click on the Export Summary button and save the file as a Text file to your desktop or other location you can find, and attach that log on your next reply.
  • If Malwarebytes won't run then please skip to the next step and let me know on your next reply.

STEP 02

Please download AdwCleaner by Malwarebytes and save the file to your Desktop.

  • Right-click on the program and select RunAsAdmin.jpg Run as Administrator to start the tool.
  • Accept the Terms of use.
  • Wait until the database is updated.
  • Click Scan.
  • When finished, please click Clean.
  • Your PC should reboot now if any items were found.
  • After reboot, a log file will be opened. Copy its content into your next reply.

 

RESTART THE COMPUTER Before running Step 3

STEP 03
Please download the Farbar Recovery Scan Tool and save it to your desktop.

Note: You need to run the version compatible with your system. You can check here if you're not sure if your computer is 32-bit or 64-bit

  • Double-click to run it. When the tool opens, click Yes to disclaimer.
  • Press the Scan button.
  • It will make a log (FRST.txt) in the same directory the tool is run. Please attach it to your reply.
  • The first time the tool is run, it also makes another log (Addition.txt). If you've, run the tool before you need to place a check mark here.
  • Please attach the Additions.txt log to your reply as well.

 

Thanks

Ron

 

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  • Root Admin

Please review the following website on how to enable Windows Defender antivirus.

https://answers.microsoft.com/en-us/windows/forum/windows_10-security-winpc/how-to-enable-and-use-the-built-in-windows/0682bf04-b8d2-4646-9dfb-e5823a5e2117

More advanced information on Windows Defender if wanted
https://docs.microsoft.com/en-us/windows/security/threat-protection/windows-defender-antivirus/windows-defender-antivirus-in-windows-10

Also look at the Windows Action Center settings on Malwarebytes under Settings, Application, and scroll down to the bottom of that page and see Windows Action Center. If needed you can tell Malwarebytes to not register itself and ensure that Windows Defender will enable itself. Then reboot.

You also appear to have some leftover elements of Avast antivirus on the computer as there are some errors in the logs showing it. Please visit this site and download their tool to fully remove all traces of Avast.

https://www.avast.com/uninstall-utility

Let me know how that goes

Ron

 

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It would seem that the problem was that I had lingering files from Avast left on the system. Once I used their uninstall tool Windows Defender came back up. Thank you!

I still seem to have an issue with system file checker coming back with errors, any advice you can give on that?

Edited by coug
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  • Root Admin

Please review the following website and follow their advice.

Though normally I'd probably use SFC first, they say to use DISM first.

https://support.microsoft.com/en-us/help/929833/use-the-system-file-checker-tool-to-repair-missing-or-corrupted-system

DISM.exe /Online /Cleanup-image /Restorehealth

Then afterwards use the SFC

 

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  • 2 weeks later...
  • Root Admin

You can download one directly from Microsoft.

If your computer does not have the Windows Recovery Environment installed and available you can use the following method to run the Recovery Environment from a bootable USB disk.

NOTE: This USB disk needs to be created from a clean computer. You cannot use an infected computer for this process

NOTE: An 8GB USB 2.0 stick is required or at least recommended. In some cases a USB 3.0 disk can be used but some computers have issues booting from USB 3.0 disks.

Example drive (no endorsement implied, example only) - This drive example has not been tested by me. It is an older 2015 model with many good reviews though.
Amazon: Kingston 8GB DataTraveler 101 G2 USB 2.0 Flash Drive (DT101G2/8GBZ)
NewEgg: Kingston 8GB DataTraveler 101 G2 USB 2.0 Flash Drive (DT101G2/8GBZ)


STEP 1
Download a Windows 10 ISO image from Microsoft.

Method A: Using the Microsoft Media Creation Tool
https://www.microsoft.com/en-gb/software-download/windows10
Download the Media Creation Tool: https://go.microsoft.com/fwlink/?LinkId=691209

Follow the instructions displayed on the tool to download the Windows 10 ISO image.

In my testing I was not prompted for a license key to download the latest Windows 10 ISO image.
At the time of this writing 2017/12/21 there was only one ISO image offered. Windows 10

32-bit x86  or  64-bit x64

Note: You need to run the version compatible with your system.
You can check here if you're not sure if your computer is 32-bit or 64-bit
 

Method B: If Method A: above is not working for you then you can try the following method
Microsoft Windows and Office ISO Download Tool (this is not an authorized Microsoft tool, but appears to be legal)
https://www.heidoc.net/joomla/technology-science/microsoft/67-microsoft-windows-and-office-iso-download-tool
Download: https://www.heidoc.net/php/Windows%20ISO%20Downloader.exe

STEP 2
If you were unable to use the Windows Media Creation Tool in STEP 1 to create a USB disk then you can use this tool to burn the Windows 10 ISO image from STEP 1 above.

Download the Windows USB/DVD Download Tool from Gitbub and save to your computer.
English version: https://github.com/mantas-masidlauskas/wudt/raw/master/Downloads/Windows7-USB-DVD-Download-Tool-Installer-en-US.exe

Then install the Windows USB/DVD Download Tool and run it to burn a bootable USB disk from the ISO image. Browse to the location where you saved the Windows 10 ISO image in STEP 1
Note: This tool should work on XP, Vista, Windows 7, or Windows 10 - it is simply used to make a bootable USB disk. Remember, all of this needs to be done on a clean computer.

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Edited by AdvancedSetup
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  • Root Admin

Due to the lack of feedback, this topic is closed to prevent others from posting here.

If you need this topic reopened, please send a Private Message to any one of the moderating team members. Please include a link to this topic with your request.

This applies only to the originator of this topic. Other members who need assistance please start your own topic in a new thread.

Thanks

 

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  • Root Admin

Glad we could help.

If you need this topic reopened, please send a Private Message to any one of the moderating team members. Please include a link to this topic with your request.

This applies only to the originator of this thread.Other members who need assistance please start your own topic in a new thread.

Thanks

 

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