Solved Windows Defender link

While I was away from home my wife started up PC and it installed Windows 11. I was about to go to 11 after I cleaned up a few things, etc.
Anyway , I now cannot open Windows security, it's telling me I need an App to open WD link. I would be happy to go back to W10 if needed.
Thanks for any suggestions ...

I'd say, either go back to Windows 10 (you have a set amount of days after upgrading to downgrade) or do an in-place upgrade of 11 over itself to see if that fixes it.

You could also try these to see if any of them find/fix a problem:

thanks for the reply. I don't know about batch / dism , where to enter ?

Sorry about that... click Start and in the search box type "Command Prompt" and right-click it, click "Run As Administrator" and enter those commands one at a time and let them run before running the next one.

the dism entries come up with error 87's
the scannow showed no integrity problem

thanks , I will be working with it on and off today . and checking in later here.
may just go another way...

@LIZZRD
The problem is well known. The fix is there in microsoft forum:
-https://techcommunity.microsoft.com/t5/windows-insider-program/issue-with-windows-defender-on-windows-11/m-p/2621453/page/15

(third post)


You must be using Powershell & you must be using administrator permissions !
Enter:-(Copy&Paste) the following:-


Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage