Windows 10: Antivirus disappeared, can't turn on windows defender, can't update windows (0x80070424)

Hello,


I'm on windows 10 family version 1803. Last time my computer checked for update: 14.09.2018


I recently realised that no system update have been done for 10 months and that F-Secure was not on my computer anymore (just a shortcut on my desktop leading nowhere). When I try to update I have an error with the number "0x80070424".


When I go in Windows Defender, it tells me that it is deactivated and that my system administrator is in charge (and I can't activate Defender antivirus, it's greyed). Everything in Defender is kinda "freezed", I can't do lots of things. Firewall seems to be on even if it's telling me that it's parameters are susceptible to compromise the security of my machine. Anything I try to restore/reinitialize on Defender does nothing.


I already tried some manipulations to get back Windows Update (the ones that doesn't need a second computer here: https://support.microsoft.com/fr-ch/help/976275) but nothing do the job.


I don't know what kind of info are needed to get this thing done. I don't even know if both problems are linked... Please help


Any ideas?


Thanks in advance <3

:)

 

Task to auto update windows defender definitions disappears

My mom has a new laptop with windows 8.1, we always set the windows updates to manual.
On our other windows 8.1 computers I have created a task for auto updating windows defender definitions, which works fine for us.

This is how I created this task:

"Click on "Create Task", name it what you like (mine is Daily Signature Update), set the trigger as the time you want it to run every day.

For Action browse to Program Files\Windows Defender\MpCmdRun.exe and select it. In "Add arguments" add -SignatureUpdate -MMPC"

But somehow this task disappears once it has run on my mom's laptop.
I'm logged in as admin and then I also tried it with running the task scheduler as admin, the task just disappears every day for some reason, while it works fine on our other windows 8.1 computers.

Anyone an idea why this task disappears every time?

Thanks.

 

avast free antivirus vs windows defender

>it's true that Avast Free Antivirus is better by a lot compare to windows defender?

As
BulldogXX already mentioned: That's a matter of opinion.

Suggestion to read:

• Choosing an Anti-Virus Program
• Safe Steps for Replacing your Anti-virus - Why should you use Antivirus
  software?
• Supplementing your Anti-Virus Program with Anti-Malware Tools
• Best Practices for Safe Computing - Prevention of Malware Infection
  

Suggestion to watch:

 

Is Windows Defender a proper Antivirus for Windows 10 ?

1) Yes.

2) Yes.

3) Many. Suggestion to use your preferred search engine and look it up. Also see:

https://support.microsoft.com/en-us/help/18900/consumer-antivirus-software-providers-for-windows

Suggestion to read:

• How to Use the Built-in Windows Defender Antivirus on Windows 10
• Configure Windows Defender in Windows 8, 8.1 and 10
  
• What’s the Best Antivirus for Windows 10? (Is Windows Defender Good Enough?)
• Choosing an Anti-Virus Program
• Supplementing your Anti-Virus Program with Anti-Malware Tools
• Answers to common security questions - Best Practices

===

4) Are you spamming?