MSERT Same result & Missing Windows Defender

Question

Every time I scan with MSERT, I keep getting the same result, which means it never gets removed from my computer?

Recently I got a malware in my computer and it deleted my Windows Defender. How do I get it back?

I have already tried reinstalling Windows 10.

Answer 1

Thanks for that information, is the device connected to a Work or school account? or are you using a Work or school account? in addition, is the internet you are using your personal internet or company provided? because that is one of the main factors why we cannot activate it.

If you are using personal email and the internet, I suggest running a custom installation to fix the issue, however, the process will delete all apps but will retain all files on the PC, if you are okay with that, you may follow the steps provided below:

Step 1: Download ISO File.

Go to this link: https://www.microsoft.com/en-us/software-downlo...

Scroll down and click "Download Tool Now" then run the Media creation tool (the downloaded file)

If you agree to the license terms, select Accept.

On What do you want to do? page, select Create installation media for another PC and then select Next.

Select the language, edition, and architecture (64-bit or 32-bit) for Windows 10. This table will help you decide which edition of Windows 10 you’ll choose:

On Select which media you want to use click ISO file and save it to Desktop.

Step 2:

Once you are done downloading the ISO, right-click > Then click Mount

Then follow the steps from Number 4 to the last from this link:

https://www.tenforums.com/tutorials/120352-cust...

Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

Answer 2

I've done that before making a post in this site, I did it again because you said so.
But it still doesn't work

Answer 3

Hi, thank you for the detailed reply, if none will work from the above solution, I suggest doing an in-place upgrade wherein it will upgrade the device to the latest version and repair all issues without deleting any files.

Note: before doing this make sure to create a restore point: https://support.microsoft.com/en-hk/help/402753...

1. go to this link: https://www.microsoft.com/en-us/software-downlo...
2. Select Download Now, and select Run. You need to be an administrator to run this tool.
3. On the License terms page, if you accept the license terms, select Accept.
4. On the What do you want to do? page, select Upgrade this PC now, and then select Next.
5. After downloading and installing, it should fix the issue.

Reference: https://www.microsoft.com/en-us/software-downlo...

Answer 4

I've tried all and nothing worked.

Pic for Method 3 ^

Answer 5

Hi and thanks for reaching out. My name is Bernard a Windows fan like you. I'll be happy to help you out today.

Do you have third-party anti-virus? if yes that is normal that you cannot turn it on, if none, you may follow the steps below:

First, you need to check if you have a work or school account:

Open Settings> Click Accounts> Click Access work or school then disconnect the account there, if no account or already disconnected and you have the same issue follow the steps below:

You need to get back the default services of Windows defender, you can do it here:

https://www.tenforums.com/tutorials/57567-resto...

Note: This is will also work for Windows 11

Look for Windows Defender Advanced Threat Protection and

Windows Defender Firewall

Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

Method 2. Reinstall Windows Defender

Open the registry, then go to

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender

Then delete the Windows Defender folder, then restart the PC and check it again.

Method 3. Repair Windows Store and Windows Defender:

On Powershell(admin), copy and paste the command below:

Get-AppXPackage | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

Then hit Enter, once the process is done, restart the PC and check.

Let me know how it goes and I hope that helps.

Bernard

Independent Advisor