Windows Security "You'll need a new app to open this windowsdefender"

Like the subject line reads, when I try to open anything in the "Windows Security" page in Settings, it prompts me to open it with a new app and the only thing available is the Microsoft Store. I click "Virus & threat protection," and the prompt comes up with "You'll need a new app to open this windowsdefender" and only allows me to choose "Look for an app in the Microsoft Store." The same prompt appears if I try to click any other menu item in Windows Security.

This has been happening since I purchased this computer a couple of months ago. Everything is up to date. Picture below:

 

Question Info


Last updated April 4, 2020 Views 1,243 Applies to:
Hello,

My name is Patricia and I am an Independent Advisor. I am here to help you today.

Please run these Tools
http://aka.ms/diag_apps10
https://aka.ms/wudiag

If the troubleshooter didn’t get the job done, we can as well try to reset the Store. This is fairly simple, and it requires running just one single command. Here’s what you need to do:
Go to Search, type wsreset.exe.
Open WSReset.exe and let the process finish.

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Hello rkaplan2,

I'm Independent Advisor and Microsoft MVP, here to help you with your question.

Please try these suggestions:

Run services.msc to open Services Manager. Ensure that the Windows Defender service is started and set to Automatic.

You may need to re-register the following dll files and see if it helps you. Run each command in an elevated command prompt one after the other and hit Enter:

regsvr32 wuaueng.dll
regsvr32 wucltui.dll
regsvr32 softpub.dll
regsvr32 wintrust.dll
regsvr32 initpki.dll
regsvr32 wups.dll
regsvr32 wuweb.dll
regsvr32 atl.dll
regsvr32 mssip32.dll

Also run regedit command and navigate to the following key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender

Here ensure that the value of these DWORDS is 0 : DisableAntiSpyware and DisableAntiVirus.

Let us know if this helps!
_____________________________________________________________________________________

Helping Windows users, since 2010 · Please remember to mark replies as answers, if they helps!

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Hello,

My name is Patricia and I am an Independent Advisor. I am here to help you today.

Please run these Tools
http://aka.ms/diag_apps10
https://aka.ms/wudiag

If the troubleshooter didn’t get the job done, we can as well try to reset the Store. This is fairly simple, and it requires running just one single command. Here’s what you need to do:
Go to Search, type wsreset.exe.
Open WSReset.exe and let the process finish.

I appreciate the suggestion, but this didn't help. The problem is with Windows Security, not the Windows Store. Whenever I try to open any menu item in Windows Security, it prompts me to look for an app on the Store. There's no problem with the Store itself, however.

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Hello rkaplan2,

I'm Independent Advisor and Microsoft MVP, here to help you with your question.

Please try these suggestions:

Run services.msc to open Services Manager. Ensure that the Windows Defender service is started and set to Automatic.

You may need to re-register the following dll files and see if it helps you. Run each command in an elevated command prompt one after the other and hit Enter:

regsvr32 wuaueng.dll
regsvr32 wucltui.dll
regsvr32 softpub.dll
regsvr32 wintrust.dll
regsvr32 initpki.dll
regsvr32 wups.dll
regsvr32 wuweb.dll
regsvr32 atl.dll
regsvr32 mssip32.dll

Also run regedit command and navigate to the following key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender

Here ensure that the value of these DWORDS is 0 : DisableAntiSpyware and DisableAntiVirus.

Let us know if this helps!

So I ran the commands in Command Prompt as an administrator, and encountered some errors while trying to register the following:

regsvr32 wuaueng.dll

regsvr32 wucltui.dll

regsvr32 initpki.dll

regsvr32 wuweb.dll

Here are a couple of screen shots of the errors I encountered:

All but those 4 dll files were successfully registered.

Under the regedit DWORDS values, they are 0. I still click on menu items in the Windows Security menu, and it still prompts me to look for an app on the Windows Store as if I don't really have Windows Defender on my computer.

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Hello,
I know the problem is in Windows Security, but what I gave you are the known fixes for that issue.

TRy to repair the system files with SFC and DISM.

1- Right click on Start Button, then select "Windows PowerShell (admin)" or "Command Prompt (admin)"
2- Now repair any damage in the system files, by running this commmand
sfc /scannow
3- Then check the System Health by running this command
dism /online /cleanup-image /restorehealth

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Hello,
I know the problem is in Windows Security, but what I gave you are the known fixes for that issue.

TRy to repair the system files with SFC and DISM.

1- Right click on Start Button, then select "Windows PowerShell (admin)" or "Command Prompt (admin)"
2- Now repair any damage in the system files, by running this commmand
sfc /scannow
3- Then check the System Health by running this command
dism /online /cleanup-image /restorehealth

Done, still didn't resolve the issue. Verification and restoration both completed with no problems.

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4 failed with 2 different errors:

regsvr32 wuaueng.dll : entry point not found....make sure wuauend.dll is a valid dll….

the module X failed to load...the specified module could not be found
regsvr32 wucltui.dll

regsvr32 initpki.dll 
regsvr32 wuweb.dll

new (2019) Dell Latitude 3390

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I have identical initial problem and same, identical, results with these suggestions.

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Again. Tried both, same symptoms, same results. I did change setting for apps to allow installation from other than Windows Store. But no impact.

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