Windows 10: Unable to turn on windows defender.

Hi,I am unable to turn on windows defender. When I try to open up using control panel it shows the following message: The windows security center service cannot be started. Please help me with this as my device is vulnerable.

:)

 

Unable to turn off Windows Defender

Hello,

Thank you for posting your query on Microsoft Community.

As per description, you are unable to turn off windows defender.

I suggest you try restarting Windows Defender service and check if issue is resolved. To do so kindly follow the below given steps:

• Press Windows key + X key and type services.msc,
  hit enter.
• Search Windows Defender Service.:1) Windows Defender Service ; 2)
  Windows Defender Network.
• Right click on each and press Start.
• Restart your computer and check if issue persist.

Hope this information is helpful. Please do let us know if you need further assistance with Windows, we’ll be glad to assist you.

 

Unable to turn on Windows Defender real time protection

Hi guys, I'm a bit desperate here right now. *Confused

I have the same problem that this guy over here. I'm running Windows 10 Home x64, version 1607, build 14393.0.

I had to restore the PC to a previous point because I ****ed up some drivers. Then my AV (Bitdefender Free) started having some issues (they gui didn't display correctly) so I decided to uninstall it and just go with Windows Defender.

The problem is I can't get it to work... I get a notification in the Action Center saying to turn on the virus protection, when I click it, Windows Defender goes green(PC status: protected, Real time protection: on) for a second and then goes yellow again (PC status: Windows Defender is OFF, Real time protection: Handled by another AV program) and I get the notification again. If instead of clicking the notification I click "Turn on" on the Windows Defender gui, Windows opens another window, "Apps & Features" in settings, like asking me to uninstall the other, nonexistent AV.

Now, I've tried a lot of things...

• Of course, I have completely uninstalled Bitdefender. I used the official tool provided by them for this. There is nothing in the registry by bitdefender nor any file or folder by that name in my PC.

• I have tried every step listed here.

• I have tried to install another AV (Avast) and the uninstall it to see if this would "reset" somehow windows defender. (Nope.)

• I have tried option #2 here Windows Defender - Turn On or Off in Windows 10 - Windows 10 Forums

• I have run MBAM and nothing pops-up

In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender there is noDisableAntiSpyware key. But in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender there is a DisableAntiSpyware key and its value is 0. (Not sure if this is important but wanted to give you the info.)

Anyone has any idea? Right now I'm thinking of downloading another AV or just go without any and be done with it. *Huh

 

WINDOWS DEFENDER is turned off

Hi Ahmed,

Since you're not able to turn on Windows Defender as well, we'd like to know if you have made any changes recently prior to this issue. In the meantime, you may follow the steps below on how to turn on Windows Defender manually:

• Type Windows Defender in the Search bar and press
  Enter.
  
• Go to Settings and make sure that the Turn on real-time protection recommended option is turned on.
  

Same thing with the other members who are having the same issue, we suggest that you check if the service was setup to
Automatic in the Services option. Please follow the steps that we've provided last
September 3, 2017.

Let us know how if you were able to turn it on properly by changing the Startup type to Automatic.