Last updated on October 4th, 2020
On a Windows 10-based computer, the Defender Antivirus Security Center may encounter the error: ”
Threat Service has stopped. Restart it now
.” The easy way to fix the problem, is to press the “Restart now” button to start the threat service, but in some cases this doesn’t work
and you receive a new error message that says ”
Unexpected error, Sorry, we ran into a problem. Please try again.”
This tutorial contains instructions to fix the following problem in Windows 10 Defender Virus & threat protection status: ”
Threat Service has stopped. Restart it now
.”
How to FIX: Threat Service has stopped. Restart it now, in Windows 10.
Method 1. Uninstall Third-party Antivirus.
First of all ensure that you haven’t installed any other third-party antivirus on your machine, because when you install a third party antivirus in Windows 10, the Windows Defender security is disabled automatically, and the “Threat Service has stopped. Restart it now” error in Windows Security center is just an informational message..
Method 2. Check your system for viruses.
Important:
The next step to resolve the Defender error ”
Threat Service has stopped. Restart it now
” in Windows 10, is to make sure that your computer is 100% clean from harmful programs like rootkits, malware or viruses. To accomplish this task, follow the steps from this
Quick Malware Scan and Removal Guide
. If, after ensuring that your PC is virus free and the threat service is unable to start, continue to the methods below.
Method 3. Modify the Registry Policy for the Windows Defender.
1. Open
Registry Editor. To do that:
1. Simultaneously press the
Win
+
R
keys to open the run command box.2. Type
regedit
and press
Enter
to open Registry Editor.
2.
Navigate to this key at left pane:
-
HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows Defender
3.
Now look at the right pane if you can see a DWORD value named:
DisableAntiSpyware
A.
If you find the ‘DisableAntiSpyware DWORD then double click on it and change its value data from 1 to
0
B.
If you don’t find the “DisableAntiSpyware’ DWORD value, then:
1. Right-click at an empty space on the right pane, and from the menu that appears, choose:
New
>
DWORD (32-bit) Value.
2. Name the new value:
DisableAntiSpyware
and press
Enter.
4.
Close
Registry Editor.
5. Restart
your computer.
Method 4. Enable the Windows Defender Antivirus Service in Registry.
1. Open
Registry Editor.
2.
Navigate to this key at left pane:
-
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServices
WinDefend
3.
At the right pane, modify the
Start
REG_DWORD value, from 4 to
2
4.
Close registry editor and
restart
your computer. *
* Note:
If you cannot modify the Start value, with error: ”
Cannot Edit Start: Error writing the value’s contents
“, then try to modify the registry in Safe Mode and if you fail again, continue to the next method.
Method 5. Enable the Windows Defender Antivirus Service in Registry OFFLINE
Step 1. Create a System Restore Point. *
* Note:
This step is optional, but, for precautionary reasons I suggest to create a restore point of your system current state in order to
restore your PC
if something goes wrong.
To Create a restore point:
1.
Open Windows Explorer.
2.
At the left pane, right-click on “This PC” icon and select
Properties
.
3.
Click
System Protection
.
4.
At System Protection settings, click
Configure
.
5.
At Restore Settings window:
a. Check the
Turn on system protection.
b. Adjust the maximum disk space used for system protection, to (about) 10-15% of the maximum disk space.c. Click
OK
.
6. Now click
Create
to create a restore point of the current state.
7.
Type a recognizable name for the restore point and click
Create.
When the operation is completed, continue to step-2.
8.
Step 2. Modify the ‘WinDefend’ registry key Offline.
1.
Proceed and start Windows 10 in recovery mode. To do that use one of the following ways:
A. From Windows GUI:
Right click on
Start
menu and then press the
Restart
button while pressing the
SHIFT
key on your keyboard.Advertisements
B. From Windows Sign-in screen:
Click on the
Power
button and then choose
Restart
while pressing the
SHIFT
key on your keyboard.
2.
At Recovery options, go to
Troubleshoot
->
Advanced Options
->
Command Prompt
. (Your computer will restart)
3.
After restart, select an account with administrative privileges, type the password (if any) and click
Continue
.
4.
In command prompt window type
regedit
and press
Enter
.
5.
In Registry Editor,
highlight
the
HKEY_LOCAL_MACHINE
key.
6.
From
File
menu, select
Load Hive.
7.
At
‘Look in’
select the disk where Windows are installed on (commonly is listed as disk “D:”).
8.
Now navigate to the following path on the OS disk:
-
Windowssystem32config
9.
Highlight the
SYSTEM
file and click
Open
.
10.
Type a Key Name for the offline registry database (e.g. ”
Offline
“) and press
OK
.
11.
Now navigate at the following registry key:
-
HKEY_LOCAL_MACHINEOfflineSYSTEMControlSet001ServicesWinDefend
12.
At the right pane, modify the
Start
REG_DWORD value, from 4 to
2
and click
OK.
13.
When done, highlight the key you previously created (e.g. the ”
Offline
” key ) and from the
File
menu, choose
Unload Hive
to write back the changes you made to the Registry.
14.
Select
Yes
when asked to unload the current key,
15. Close
the ‘Registry Editor’ and the ‘Command Prompt’ windows.
16.
Click
Turn off your PC.
17.
Power On you PC and boot to Windows normally.
Method 6. FIX Windows Problems with DISM & SFC tools.
1.
Open command prompt as administrator. To do that:
1. In the Search box type:
cmd
or
command prompt
2. Right click on the
command prompt
(result) and select
Run as Administrator
.
2.
At the command prompt window, type the following command & press
Enter:
-
Dism.exe /Online /Cleanup-Image /Restorehealth
3.
Be patient until DISM repairs the component store. When the operation is completed, (you should be informed that the component store corruption was repaired), give this command and press
Enter
:
-
SFC /SCANNOW
4.
When SFC scan is completed,
restart
your computer.
Method 7. Repair Windows 10 with an in-place Upgrade.
Another method that usually works, to fix Windows problems, is to perform a Windows 10 Repair-Upgrade, by using the Media Creation tool to create an ISO or USB Windows 10 install media. For that task follow the detailed instructions on this article:
How to repair Windows 10.
That’s it! Which method worked for you?
Let me know if this guide has helped you by leaving your comment about your experience. Please like and share this guide to help others.
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