Solved Can't update Windows Defender - Windows 11

WiktorWdowiak · Aug 27, 2021

Hello!
After update 22000.132, I can't update Windows Defender.
I thought that it's an bug, and next update (22000.160) will fix it, but it didn't

This is what is displaying when I try to update Windows Defender:

Do you guys know what can I do, to make Windows Defender finally update?

NOTE: I can't really do a clean install

cineman195 · Aug 27, 2021

Can you try this ?

Manually Update Definitions for Windows Defender in Windows 10

How to Manually Update Security Intelligence Definitions for Windows Defender Antivirus in Windows 10. The app uses security definitions to detect threats.

winaero.com

FreeBooter · Aug 27, 2021

Use Windows Update Troubleshooter.

Right-click on Start button and pick Settings
Go to System > Troubleshoot > Other troubleshooters
Click on Windows Update and select Run

Download Windows updates manually.

Go to the official Microsoft update catalog;
Enter a specific update code, for example, KB4481031
Select the correct version and click Download
Click on the link and Windows will update your computer

Resetting the Windows Update components can usually solve these types of issues.

Reset Windows Update in Windows 10

How to Reset Windows Update in Windows 10

www.tenforums.com

Fabler2 · Aug 27, 2021

You could also try to reset Win Security. All Apps- right click Windows Security, more, app settings- reset or try repair.

WiktorWdowiak · Aug 27, 2021

cineman195 said:
Can you try this ?

Manually Update Definitions for Windows Defender in Windows 10

How to Manually Update Security Intelligence Definitions for Windows Defender Antivirus in Windows 10. The app uses security definitions to detect threats.

winaero.com

I tried

Trigger a definition update for Windows Defender Antivirus using command prompt

And this is what displayed, when I used those commands in cmd (With Admin Privilages):
"%ProgramFiles%\Windows Defender\MpCmdRun.exe" -removedefinitions -dynamicsignatures:
Service Version: 0.0.0.0
Engine Version: 0.0.0.0

No engine/signature is currently loaded.

"%ProgramFiles%\Windows Defender\MpCmdRun.exe" -SignatureUpdate:
Signature update started . . .
Service Version: 0.0.0.0
Engine Version: 0.0.0.0
ERROR: Signature Update failed with hr=0x800106ba
CmdTool: Failed with hr = 0x800106ba. Check C:\Users\gamin\AppData\Local\Temp\MpCmdRun.log for more information

WiktorWdowiak · Aug 27, 2021

FreeBooter said:
Use Windows Update Troubleshooter.

Right-click on Start button and pick Settings

Go to System > Troubleshoot > Other troubleshooters

Click on Windows Update and select Run

Download Windows updates manually.

Go to the official Microsoft update catalog;

Enter a specific update code, for example, KB4481031

Select the correct version and click Download

Click on the link and Windows will update your computer

Resetting the Windows Update components can usually solve these types of issues.

Reset Windows Update in Windows 10

How to Reset Windows Update in Windows 10

www.tenforums.com

I tried that, but it's not a Windows Update problem.
Other updates install normally

WiktorWdowiak · Aug 27, 2021

FreeBooter said:
Use Windows Update Troubleshooter.

Right-click on Start button and pick Settings

Go to System > Troubleshoot > Other troubleshooters

Click on Windows Update and select Run

Download Windows updates manually.

Go to the official Microsoft update catalog;

Enter a specific update code, for example, KB4481031

Select the correct version and click Download

Click on the link and Windows will update your computer

Resetting the Windows Update components can usually solve these types of issues.

Reset Windows Update in Windows 10

How to Reset Windows Update in Windows 10

www.tenforums.com

WiktorWdowiak · Aug 27, 2021

Fabler2 said:
You could also try to reset Win Security. All Apps- right click Windows Security, more, app settings- reset or try repair.

I made that, but when I tried to update again, I still have errors:

Fabler2 · Aug 27, 2021

WiktorWdowiak said:
I made that, but when I tried to update again, I still have errors:
View attachment 6428

So it's proved it's a win update error. As @FreeBooter suggested last in his post to reset WU will work.

WiktorWdowiak · Aug 27, 2021

Fabler2 said:
So it's proved it's a win update error. As @FreeBooter suggested last in his post to reset WU will work.

I did reset Windows Security, but it didn't worked.
I did run Windows Update Troubleshooter, but it also didn't work
I even tried to download update manually, but it also didn't work

Fabler2 · Aug 27, 2021

WiktorWdowiak said:
I did reset Windows Security, but it didn't worked.
I did run Windows Update Troubleshooter, but it also didn't work
I even tried to download update manually, but it also didn't work

See post #3

WiktorWdowiak · Aug 27, 2021

Fabler2 said:
See post #3

View attachment 6429

I did reset/reregister right now, then restarted my computer, and I still have 0x80070643 errors:

I did also check Windows Security app, and I only have these options:

I got this feeling that something is missing here, but I don't really remember

Fabler2 · Aug 27, 2021

Try manually updating from within Windows Security. Virus and threat protection and scroll down to Virus and threat protection updates and click the link for Protection updates.

WiktorWdowiak · Aug 27, 2021

Fabler2 said:
Try manually updating from within Windows Security. Virus and threat protection and scroll down to Virus and threat protection updates and click the link for Protection updates.

The problem is, I don't have tab Virus and threat protection in Windows Security:

Fabler2 · Aug 27, 2021

Missed it first time

As you have the Home version try the registry fix in @Brink 's tutorial here.

FreeBooter · Aug 27, 2021

How to Fix Windows Update Error 0x80070643

The 0x80070643 error can occur on Windows when a problem arises during an update. Here's what to do when you see this error.

www.lifewire.com

Repair Install Windows 11 with an In-place Upgrade

This tutorial will show you how to do a repair install of Windows 11 by performing an in-place upgrade without losing anything. If you need to repair or create a new recovery partition or having problems with the Windows 11 operating system on your PC, and the usual solutions will not fix it...

www.elevenforum.com

WiktorWdowiak · Aug 27, 2021

Fabler2 said:
Missed it first time
As you have the Home version try the registry fix in @Brink 's tutorial here.

Okay, I'll try that

WiktorWdowiak · Aug 27, 2021

FreeBooter said:
How to Fix Windows Update Error 0x80070643

The 0x80070643 error can occur on Windows when a problem arises during an update. Here's what to do when you see this error.

www.lifewire.com

Repair Install Windows 11 with an In-place Upgrade

This tutorial will show you how to do a repair install of Windows 11 by performing an in-place upgrade without losing anything. If you need to repair or create a new recovery partition or having problems with the Windows 11 operating system on your PC, and the usual solutions will not fix it...

www.elevenforum.com

Can I use UUP Dump for In-place Upgrade?

FreeBooter · Aug 27, 2021

WiktorWdowiak said:
Can I use UUP Dump for In-place Upgrade?

Yes you can do that.

Fabler2 · Aug 27, 2021

WiktorWdowiak said:
Can I use UUP Dump for In-place Upgrade?

I'm assuming the reg fix didn't work?
Hopefully the in-place upgrade will work for you. It didn't with my issue with Defender but that's another story.

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Trigger a definition update for Windows Defender Antivirus using command prompt​

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Trigger a definition update for Windows Defender Antivirus using command prompt