It can help to scan the entire operating system and protect the PC against malware and viruses in real-time.
in case you find one of these issues, nudge the given link to find solutions.
Besides, you may be hit by another common unexpected error threat service has stopped restart it now.

This is the topic that we will discuss today.
When trying to launch this antivirus program, you may see this oops message.
If you click theRestart nowbutton, the service starts and the error disappears.
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However, if not, another error occurs on the computer screen saying Unexpected error.
Sorry, we ran into a problem.
c’mon have another go.
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Well then, how can you get rid of the trouble?
Dont feel vexed since you could easily fix this error after trying the methods below.
Get a solution from this post.

Or else, you may get the error Threat service has stopped.
Restart it now in Windows 11/10.
Or it’s possible for you to pressWin + R, typeservices.mscand clickOK.

What if there is an issue with Microsoft Defender antivirus service high memory usage?
Lets explore fixes together!
If any service is stopped, start it.

Just double-punch it and chooseStart.
To do this work, follow the guide -How to Back up Individual Registry Keys Windows 10/11.
See how to do this task:
Step 2: ClickYesin the User Account Control window to continue.
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Step 3: Navigate to this path step by step:HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender.
Or it’s possible for you to copy & paste the path to the address bar and pressEnter.
Give a name to one.

Then, change the value data of each item to0.
Besides, there is another thing you could have a shot.
Step 1: Go to the path:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinDefend.
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Step 2: In the right pane, double-choose theStartitem and change its value data to2from4.
To fix Windows Security threat service has stopped restart it now, try the next method.
Besides, prepare a USB flash drive and connect it to another PC.

Step 1: Go toHKEY_LOCAL_MACHINE\System\CurrentControlSet\Services, right-click onSecurityHealthServiceorWinDefendand chooseExportto export the file to your USB drive.
Then, name the file asSecurityHealthServiceorWinDefend.
Step 2: Eject the USB drive from the PC and plug it into your machine.

Uninstall Third-Party Antivirus
Sometimes Threat service has stopped.
Restart it now is only an informational message.
Go to uninstall this software since it can interfere with Windows Security/Windows Defender.
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Just go to Control Panel and clickUninstall a programfrom theProgramcategory.
Right-pick the antivirus program and clickUninstall.
This post shows you multiple methods for this work.

Step 1: Typecommand promptin the search box in Windows 10/11 and clickRun as administratorfrom the right pane.
Step 2: Typesfc /scannowand pressEnterto begin verification.
Sometimes System File Checker fails to scan and it may get stuck at verification.
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Step 3: After finishing the SFC scan, typeDism.exe /Online /Cleanup-Image /Restorehealthto the CMD window and pressEnter.
This process will take a few minutes and wait patiently.
To do this task, we strongly recommend using MiniTool ShadowMaker, a professionalPC backup softwarefor Windows 11/10/8/7.
It can be used to back up files, folders, systems, disks, and partitions.
This program can meet your requirements well.
It is free to use to enjoy all the features in 30 days.
Just go for the following button to download it.
How to create a backup?
Using Windows 11 backup software to do it.
Step 3: Go toDestinationand choose a path to save the backup.
An external hard drive or a USB flash drive is recommended.
Step 4: Click theBack up Nowbutton to execute this task at once.
Next, it is time to perform an in-place upgrade to fix threat service has stopped restart it now.
See the guide below to know how to do this work.
Step 2: Double-press the exe file on your PC and clickYesin the User Account Control interface.
Step 4: Check the option ofUpgrade this PC nowand clickNextto go on.
Can you create a Windows 10 recovery USB for another PC?
How to create such a repair USB drive?
The ways will be introduced in this post.
Step 5: This tool is downloading Windows 10 and this can take a few minutes.
During the process, you might feel free to keep using your PC.
Step 6: This tool is checking for updates and wait patiently.
Step 7: When everything is ready, click theInstallbutton to start installing Windows 10.
If you want to keep other things during the installation, clickChange what to keepand grab the corresponding option.
More Solutions to Protect PC.
(12 Methods).
Final Words
Threat service has stopped restart it now is a common issue on Windows 10/11.
If you find some other methods to help you out, you might write it in the comment below.
Besides, after fixing the issue, we strongly recommend backing up your PC to keep the machine safe.