Virus and threat protection engine unavailability issue on Windows 10/11

Windows Defender is a feature that protects the system from virus attacks. When trying to install the latest security Virus and threat protection engine unavailability issue on Windows 10/11s, some users received an error message stating "Virus and threat protection engine is unavailable." This error is mainly due to corrupted system files, outdated Virus and threat protection engine unavailability issue on Windows 10/11s on the system or some issues in Windows Virus and threat protection engine unavailability issue on Windows 10/11s, etc. It can be solved by installing the latest Virus and threat protection engine unavailability issue on Windows 10/11s, resetting the Windows Security application, adjusting Registry Editor keys, etc. In this article, we provide some solutions to help you resolve this issue on your Windows computer.

Method 1 – Run the Windows Update Troubleshooter

Step 1 –Use the Windows I key together to open Window Settings

Step 2 –Click on Update and Security

Step 3 – In On the left, click Troubleshooting

##Step 4 –On the right, click Other Troubleshooting

Step 5 –Find Windows Update and select it. Then click on the Run Troubleshooter button

Step 6 –If there is any issue, it will suggest fixes and click on Apply.

Step 7 – Restart the computer and check if the problem is resolved.

Method 2 – Manually install the latest Security Intelligence Virus and threat protection engine unavailability issue on Windows 10/11

Step 1 –Go to the Microsoft website

Step 2 – Scroll down to the Manually Download Updates section

Step 3 – Click the next to the version that applies to your PC Microsoft Defender Antivirus for Windows 11, Windows 10, Windows 8.1 and Windows Server. Here I choose 64-bit

Step 4 – The mpam-fe.exe file will be downloaded. Once the download is complete, Double-click the file and follow the on-screen instructions Installation

## Step 5 –

Reboot after installation Computer and check if the problem is resolved. Method 3 – Check for Corrupted File System

Step 1 –

Open the

Virus and threat protection engine unavailability issue on Windows 10/11 as administrator Prompt . To do this, type cmd in the window search, then simultaneously hold down the Ctrl Shift key, and then press EnterStep 2 –

A User Account Control window will appear. Click

is Step 3 –

In the Virus and threat protection engine unavailability issue on Windows 10/11 prompt

copy and paste the following Virus and threat protection engine unavailability issue on Windows 10/11s one by one Press Enter key. It will take a few minutes to complete the execution process

sfc /scannow

DISM /Online /Cleanup-Image /RestoreHealth

## Step 4 – Restart the computer and check if the error has been resolved Solution

Method 4 – Update Windows Defender using Windows PowerShell

Step 1 –Press the

Windows X

keys simultaneously. From the list that appears, click Windows PowerShell (Admin)

Step 2 – will open a User Account Control window, click

"Yes

"Step 3 –Type the following Virus and threat protection engine unavailability issue on Windows 10/11 in the PowerShell window and press

Enter

key

Virus and threat protection engine unavailability issue on Windows 10/11 ../..

Step 4 –Copy

and

pastethe following required Virus and threat protection engine unavailability issue on Windows 10/11s in PowerShell as required and press Enter keyIf you need to Virus and threat protection engine unavailability issue on Windows 10/11 the anti-malware definitions, please use the following Virus and threat protection engine unavailability issue on Windows 10/11

Update-MpSignature

If you need to Virus and threat protection engine unavailability issue on Windows 10/11 the server from Microsoft Update anti-malware definitions

Update-MpSignature -UpdateSource MicrosoftUpdateServer

The total Virus and threat protection engine unavailability issue on Windows 10/11 is as follows

Update-MpSignature [-UpdateSource  {InternalDefinitionUpdateServer | MicrosoftUpdateServer | MMPC | FileShares} ]

Step 5 –

After executing the Virus and threat protection engine unavailability issue on Windows 10/11,

restart

System and check if the problem has been resolved.

方法 5 – 重置 Windows 安全性

步骤 1 –同时按下 Windows + X 键。从出现的列表中，单击Windows PowerShell（管理员）

步骤 2 –将打开一个用户帐户控制窗口，单击“是”

第 3 步 –在PowerShell窗口中键入以下命令，然后按回车键

Get-AppxPackage *Microsoft.Windows.SecHealthUI* | Reset-AppxPackage

第 4 步 –执行完成后，关闭终端并重新启动计算机。现在检查问题是否已解决。

方法 6 – 更改 Windows 注册表编辑器中的设置 

步骤 1 –同时使用 Windows + R 键打开运行提示

步骤 2 –在运行提示符中键入注册表编辑器并按回车键

第 3 步 –用户帐户控制窗口将打开，单击是。这将打开注册表编辑器

第 4 步 –在注册表编辑器中导航到以下路径，或将以下路径复制并粘贴到注册表编辑器的地址栏中，然后按回车键

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender

步骤 5 –在右侧，双击禁用反间谍软件键

步骤 6 –如果不存在，请创建它。要创建，请右键单击空白区域，然后单击新建。从出现的列表中单击 DWORD（32 位值）

步骤 7 –给它起个名字 禁用反间谍软件 然后双击它

步骤 8 –确保值数据为 0。然后点击确定

步骤 9 –同时双击禁用防病毒键。如果不存在，则按上述步骤[步骤6-步骤7]所示创建它

步骤 10 –将值数据定为 0，然后单击确定

步骤11 –重新启动计算机，然后检查问题是否已解决。

方法7 –重置PC

步骤 1 –一起使用Windows + I键打开窗口设置

步骤 2 –点击更新和安全

第 3 步 –在左侧单击恢复

第 4 步 –在右侧的“重置此电脑”下，单击“开始使用”按钮

步骤 5 –从出现的窗口中，选择保留我的文件。此选项将重置您的 PC，而不会删除您的个人文件。现在检查问题是否已解决。

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