损坏的系统文件可能会导致Windows Defender无法自动启动并显示一条错误消息，其描述如下：

Windows Defender
服务无法启动
请求的资源正在使用中。
错误代码：0x800700aa。

即使手动启动它也没有效果。阅读您应该采取哪些步骤来修复Windows Defender 错误 0x800700aa^{(Windows Defender error 0x800700aa)}。

Windows Defender错误 0x800700aa，无法启动服务^(Service)

该消息清楚地表明无法启动所需的Windows 服务。^{(Windows Service)}以下是修复此Microsoft Defender 错误^{(Microsoft Defender error)}时需要查看的区域：

1. 检查 Windows Defender^{(Check Windows Defender)}服务状态。
2. ^(Edit)在注册表编辑器中^{(Registry Editor)}编辑WinDefend键的值。
3. 重新注册Windows Defender DLL文件。
4. 将Microsoft Defender^{(Reset Microsoft Defender)}设置重置为默认值。

让我们详细探讨一下上述方法！

1]检查Windows Defender^{(Check Windows Defender)}服务状态

Windows Defender 防火墙^{(Windows Defender Firewall)}服务通过阻止任何未经授权的用户通过Internet或其他网络访问它来帮助保护您的计算机。但是，有时它可能会表现得很奇怪，并引发像 0x800700aa 这样的错误。

要修复它，请运行services.msc^(servi)（服务管理器^{(the Services Manager)}）并确保以下服务^(Services)显示给定状态：

• Windows Defender Firewall – Automatic |开始
• Windows Defender 高级威胁防护 - 手动^{(Defender Advanced Threat Protection – Manual)}
• Microsoft Defender 防病毒网络检查服务 - 手动^{(Microsoft Defender Antivirus Network Inspection Service – Manual)}
• Microsoft Defender 防病毒服务 - 手册^{(Microsoft Defender Antivirus Service – Manual)}。

相关^(Related)：无法启动服务，^{(The Service Couldn’t Be Started, Error 0x80070422)} Windows Defender 中出现错误 0x80070422。

2]在注册表编辑器中^{(Registry Editor)}编辑^(Edit)WinDefend键的值

如果上述方法不起作用，您可以尝试注册表破解。它要求您通过获得WinDefend键的全部所有权来编辑其值数据^{(Value data )}条目。

请^(Please)注意，错误地更改注册表编辑器^{(Registry Editor)}可能会产生严重后果。可能会出现系统范围的问题，并且需要您重新安装Windows以更正这些问题。所以首先创建一个系统还原点。

1.按Windows Key + R组合，在运行^(Run) 对话框中键入 put Regedt32.exe ，然后^{(Regedt32.exe)}按 Enter^(Enter)打开注册表编辑器^{(Registry Editor)}。

2.导航到以下位置：

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinDefend

3.首先，完全拥有^{(take full ownership)}WinDefend密钥^(WinDefend)。取得所有权后，在此位置的右窗格中，查找名为Start的^(Start)DWORD。由于您面临这个问题，它的值数据^{(Value data)}必须为4，默认情况下，它的值数据^{(Value data)}应保持为2。价值数据^{(Value data)}的差异导致了这种情况的发生。所以为了修复它，双击相同的DWORD得到这个：

4.在上面的框中，将Value 数据^{(Value data)}从 4 替换为 2^{( from 4 to 2)}。单击确定^(OK)。您现在可以关闭注册表编辑器^{(Registry Editor)}并尝试启用Windows Defender保护。

它现在应该可以正常工作了。

3]重新注册Windows Defender DLL文件

在Windows操作系统中，当您运行程序时，其大部分功能可能由DLL^(DLLs)提供。此事件创建一个依赖项。因此，如果有一些程序覆盖或破坏了这种依赖关系，则原始程序可能无法成功运行。Windows Defender服务也是如此。要修复它，您需要重新注册Windows Defender DLL 文件。

打开提升的命令提示符^{(Open an elevated Command Prompt)}窗口，键入以下命令，然后依次按 Enter^{(Enter one)}：

regsvr32 wuaueng.dll
regsvr32 wucltui.dll
regsvr32 softpub.dll
regsvr32 wintrust.dll
regsvr32 initpki.dll
regsvr32 wups.dll
regsvr32 wuweb.dll
regsvr32 atl.dll
regsvr32 mssip32.dll

此后^(Hereafter)，当Windows Defender自动或手动启动时，您应该不会看到代码为 0x800700aa 的错误消息。

4]将Microsoft Defender^{(Reset Microsoft Defender)}设置重置为默认值

如果您愿意，您可以下载并使用我们的便携式FixWin将^(FixWin)Microsoft Defender设置重置为默认值。

只需启动程序并导航到左侧面板中的Additional Fixes 条目^{(Additional Fixes entry)}，如上图所示。

然后，切换到右侧的“快速修复^{(Quick Fixes)}”选项卡并向下滚动“重置 Windows Defender 设置”^{(Reset Windows Defender Settings)}选项卡。点击选项卡将 Defender 的设置重置为默认值。

Hope that helps!

Windows Defender error 0x800700aa, The Service couldn't be started

Α corrupted ѕystem file may result in Windows Defender not starting automatically and displaying an error message with the following description –

Windows Defender
The Service couldn’t be started
The requested resource is in use.
Error code: 0x800700aa.

Even starting it manually has no effect. Read what steps you should take to fix Windows Defender error 0x800700aa.

Windows Defender error 0x800700aa, The Service couldn’t be started

The message clearly says that a required Windows Service could not be started. Here are the areas you need to take a look at o fix this Microsoft Defender error:

1. Check Windows Defender service status.
2. Edit value of WinDefend key in the Registry Editor.
3. Re-register Windows Defender DLL files.
4. Reset Microsoft Defender settings to default.

Let’s explore the above methods in a bit of detail!

1] Check Windows Defender service status

The Windows Defender Firewall service helps to protect your computer by stopping any unauthorized users from getting access to it via the Internet or other networks. However, at times, it can behave oddly and throw up errors like 0x800700aa.

To fix it, run services.msc (the Services Manager) and make sure the following Services show the given status:

• Windows Defender Firewall – Automatic | Started
• Windows Defender Advanced Threat Protection – Manual
• Microsoft Defender Antivirus Network Inspection Service – Manual
• Microsoft Defender Antivirus Service – Manual.

Related: The Service Couldn’t Be Started, Error 0x80070422 in Windows Defender.

2] Edit value of WinDefend key in the Registry Editor

If the above method fails to work, you can try the registry hack. It requires you to edit the Value data entry for the WinDefend key by taking its full ownership.

Please note, making changes to the Registry Editor incorrectly can have serious consequences. System-wide problems may occur and require you to reinstall Windows to correct them. So create a System Restore point first.

1. Press Windows Key + R combination, type put Regedt32.exe in Run dialog box and hit Enter to open the Registry Editor.

2. Navigate to the following location:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinDefend

3. Firstly, take full ownership of WinDefend key. After taking ownership, in the right pane of this location, look for the DWORD named Start. Since you’re facing the issue, it must be having its Value data as 4 and by default, its Value data should remain 2. Differences in the Value data resulted in this happening. So in order to fix it, double click on the same DWORD to get this:

4. In the above box, replace the Value data from 4 to 2. Click OK. You may close the Registry Editor now and try to enable Windows Defender protection.

It should work fine by now.

3] Re-register Windows Defender DLL files

In Windows operating systems, when you run a program much of its functionality may be provided by DLLs. This event creates a dependency. So, If there’s some program that overwrites or breaks this dependency, the original program may not successfully run. The same can be the case with the Windows Defender service. To fix it, you’ll need to re-register the Windows Defender DLL files.

Open an elevated Command Prompt window, type the following commands, and hit Enter one after the other:

regsvr32 wuaueng.dll
regsvr32 wucltui.dll
regsvr32 softpub.dll
regsvr32 wintrust.dll
regsvr32 initpki.dll
regsvr32 wups.dll
regsvr32 wuweb.dll
regsvr32 atl.dll
regsvr32 mssip32.dll

Hereafter, when the Windows Defender starts automatically or manually, you should not see the error message with the code 0x800700aa.

4] Reset Microsoft Defender settings to default

If you wish, you may download and use our portable FixWin to reset Microsoft Defender settings to default.

Just launch the program and navigate to the Additional Fixes entry in the left panel as shown in the image above.

Then, switch to the Quick Fixes tab on the right and scroll down the Reset Windows Defender Settings tab. Hit the tab to reset Defender’s settings to default.

Hope that helps!

Related posts

• Windows Defender Threat Service已在Windows 10中停止

• 该Service无法启动，Error 0x80070422在Windows Defender

• Antimalware Service Executable：Fix高CPU，Memory，Disk usage

• Fix Service无法启动Windows Defender Error 0x80070422

• 什么是Windows 10中的Control Flow Guard - 如何打开或关闭它

• 如何在Microsoft Defender停止Automatic Sample Submission

• 如何将File type or Process Exclusion添加到Windows Security

• 如何手动扫描单独的文件和使用Microsoft Defender

• boot time在Windows 11/10中的Perform Windows Defender Offline Scan

• 视窗Defender Application Guard Extension为Chrome & Firefox

• 当存储Windows Defender Offline扫描日志？

• 在Windows 10上Windows Defender无法打开

• 使用ConfigureDefender立即更改Windows Security设置

• Mac的Microsoft Defender ATP现在可用于企业

• 什么是Windows 10中的WDAGUtilityAccount？我应该删除它吗？

• Fix Microsoft Defender error 0x80004004在Windows 10上

• Fix Microsoft Defender error 0x80073b01在Windows 10上

• 配置Windows Defender以扫描Windows 10中的.zip .rar .cab文件

• 在Windows 10启用或打开Microsoft Defender的通知

• Block Canvas Fingerprinting在Chrome中Canvas Defender