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Patch release blocked by Windows defender

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I just installed the new patch release 3.4.5 on my windows 10 laptop. When the installment was almost complete I got a pop up saying that there was insufficient space and then a popup from Windows Defender saying it had blocked an unauthorized installation. After closing all notifications I checked MB and it appears to have been updated correctly. I think that the same thing happened in the last update. How can I be sure that it has been correctly installed?

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  • Staff

***This is an automated reply***


Thanks for posting in the Malwarebytes 3 Help forum.


If you are having technical issues with our Windows product, please do the following: 


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  • Root Admin

Hello @ejbeak

Let us get some logs please and we'll see what we can find that might be causing this and see if the update is/was applied.


Please download the Malwarebytes Support Tool to assist us in helping you further with your issue.

It is a multi-purpose troubleshooting and repair utility, designed to assist with issues related to Malwarebytes for Windows. Our goal with the Malwarebytes Support Tool is to provide a simple and stress-free approach to troubleshooting issues with Malwarebytes products

** Download Malwarebytes Support Tool Here **

1. Please save the file where you can locate it.


2. Then close all browsers and locate the file you downloaded and double-click on it to install and run the program.


3. Place a checkmark on the "Accept License Agreement" checkbox and click the Next button.


4. Click on the "Advanced Options" link for Forum Support options


5. Click on the "Gather Logs" button


6. The program will run the FRST program in the background and gather some diagnostic logs and zip them up on your desktop as:  mbst-grab-results_zip


7. Close the Malwarebytes Support Tool and locate the file: mbst-grab-results_zip on your desktop and upload that as an attachment to your next reply.



For more information, please refer to the following links:

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Malwarebytes Support Tool FAQs

Thank you






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Sorry, I've been down that road before and I haven't got time or patience to do it again. As far as I can see the update has been installed. I'm just not sure that I won't have a problem with it later. If Windows Defender is flagging this as malicious? then that is something for your support team to sort out. Perhaps it has something to do with not listing MB in the Windows action center. That option has always been dodgy. If I list MB recommended setting it works fine until some time down the road after a reboot or update it causes Windows defender to disable itself and it can't be started again until MB is unlisted again. That bug should have been fixed a long time ago.

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  • Root Admin

I'm sorry and I can appreciate your frustration but without assistance from users such as yourself helping us to fix it, then it probably won't get fixed as most users don't experience this issue. That makes it very hard to fix something that few users experience.

Thank you for your time



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2 hours ago, ejbeak said:

If I list MB recommended setting it works fine until some time down the road after a reboot or update it causes Windows defender to disable itself and it can't be started again until MB is unlisted again. That bug should have been fixed a long time ago.

Yes, unfortunately the way Microsoft implemented Windows Defender in its most recent versions is such that it is supposed to automatically disable itself if Windows Action Center detects another antivirus product installed, so when Malwarebytes is registered as your AV protection, Windows Defender will turn itself off automatically (at least according to Microsoft that's what it is supposed to do).  This is also why, by default, Malwarebytes will not register itself with Action Center if Windows Defender is currently active so that users who wish to use both may continue to do so.

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The Windows Defender blocking is from the controlled folder access module stopping changes to the desktop shortcut.I have added exclusions for every MB folder file and exe that I can find but next time I update I will just disable this module before installing. The notification saying that I don't have enough space is bogus as there is 930 GB of free space on my drive. To you Ron. If you think nobody else is experiencing this, we will wait and see. For now, the program seems to be working fine but my confidence in this product has waned to almost zero.

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  • Root Admin

More information about Windows Defender




Disabling the Windows Security Center service will not disable Windows Defender AV or Windows Defender Firewall. These will be disabled automatically when a third-party antivirus or firewall product is installed and kept up to date.



If you do disable the Windows Security Center service, or configure its associated Group Policy settings to prevent it from starting or running, the Windows Defender Security Center may display stale or inaccurate information about any antivirus or firewall products you have installed on the device. It may also prevent Windows Defender AV from enabling itself if you have an old or outdated third-party antivirus, or if you uninstall any third-party antivirus products you may have previously installed. This will significantly lower the protection of your device and could lead to malware infection.



The Windows Defender Security Center app is a client interface on Windows 10, version 1703. It is not the Windows Defender Security Center web portal that is used to review and manage Windows Defender Advanced Threat Protection.





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The Windows Defender module causing the blocking is the controlled folder access setting. https://docs.microsoft.com/en-us/windows/security/threat-protection/windows-defender-exploit-guard/controlled-folders-exploit-guard This from what I can see was added in the 1709 update. I can not find the actual modification that it blocked as it doesn't keep a log like it does for scan detections. Exclusions can be added to this if you know the name of the folder that's tripping the warning. As I have only had this problem since the last major Windows update, I am convinced that they are related. I suggest you have your boffins look into it.

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10 hours ago, ejbeak said:

The Windows Defender blocking is from the controlled folder access module stopping changes to the desktop shortcut.I have added exclusions for every MB folder file and exe that I can find but next time I update I will just disable this module before installing. ...

Hi ejbeak:

You might be interested in reading John A's topic Need to update "Having problems using ..." thread.  This user reported that utilities like FRST and MB-Check will not run correctly if they are saved to the Windows desktop when the Controlled Folder Access feature (a.k.a. anti-ransomware) is enabled in the Windows Defender Security Center of Win 10 Version 1709.  John A could solve their problem by either temporarily disabling Controlled Folder Access or downloading FRST and MB-Check to the Downloads folder instead of the Windows desktop.

Your observation about the MB desktop shortcut seems to tie in with John A's comments.
32-bit Vista Home Premium SP2 * Firefox v52.7.3 * Norton Security Premium v22.12.1.15 * MB Premium v3.3.1.2183 (CP v1.0.262)

Edited by lmacri
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Thanks, Imacri.

I'm convinced that it is the controlled access that is causing problems. If in future it blocks something I don't want to be blocked I will add an exclusion or temporarily disable it before I install something that needs to add or modify a desktop icon. I'm surprised that the support team has not observed and corrected this by now. Another minus browny point to add to my long list of gripes about MB mark 3.

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Also, if self-protection is active in Malwarebytes, you will not be able to rename, move or delete the Malwarebytes desktop shortcut (you'll see an "Access Denied" error most likely), however turning off self-protection in Malwarebytes should resolve this.  But keep in mind that this only applies to the Malwarebytes desktop shortcut, not any other software's shortcuts or non-Malwarebytes files.

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