如果您尝试使用Windows Update更新^{(Windows Update)}Windows Defender，那么您可能不得不面对错误代码 0x80070643，它伴随着错误消息“ Windows Defender 的定义更新^{(Definition Update)}– 错误 0x80070643^{(Windows Defender – Error 0x80070643)} ”。错误代码通常表示安装过程中发生了致命错误，但没有与此错误相关的特定原因。此外，该错误并没有真正提供太多信息，但微软^(Microsoft)已经承认了这个问题，这是他们的官方声明：

感谢您对 Windows Defender 更新错误 0x80070643 的耐心等待。在此处阅读有关如何修复 Windows 10 更新或激活错误代码 0xc004f075的指南。在此处阅读有关^{(How to fix Windows 10 Update or Activation Error Code 0xc004f075 here)}如何修复 Windows 10 更新或激活错误代码 0xc004f075^{(How to fix Windows 10 Update or Activation Error Code 0xc004f075 here)}的指南。我们已意识到该问题并尝试尽快推出缓解措施尽可能。同时，要让您的机器恢复到受保护状态，您可以手动下载并应用最新的定义更新。^{(Thank you for your patience regarding Windows Defender update error 0x80070643. Read our guide on How to fix Windows 10 Update or Activation Error Code 0xc004f075 here.. Read our guide on How to fix Windows 10 Update or Activation Error Code 0xc004f075 here.. We are aware of the issue and trying to roll out mitigation as soon as possible. Meanwhile, to get your machine back to a protected state, you can manually download and apply the latest Definition Update.)}

修复 Windows Defender 更新失败并出现错误 0x80070643

现在几乎没有修复或解决问题的方法，但您需要全部尝试，因为可能对一个用户有用的东西并不一定意味着它对另一个用户有用。因此，不要浪费任何时间，让我们看看如何在下面列出的故障排除指南的帮助下修复 Windows Defender 更新失败并出现错误 0x80070643。另请在此处阅读如何执行 Windows Defender 定义更新.. 另请在此处阅读^{(How to Perform Windows Defender Definition Update here)}如何执行 Windows Defender 定义更新^{(How to Perform Windows Defender Definition Update here)}..

修复 Windows Defender 更新^{(Fix Windows Defender Update)}失败并出现错误 0x80070643

确保创建一个还原点^{(create a restore point)} 以防万一出现问题。

方法 1：手动更新 Windows Defender^{(Method 1: Update Windows Defender Manually)}

1. 按Windows Key + Q调出Windows Search，输入Windows Defender并点击搜索结果。

键入 Windows Defender 并单击搜索结果 | 修复 Windows Defender 更新失败并出现错误 0x80070643

2. 导航到 Update > Update definitions.

3.单击^(Click)更新^(Update)并等待Windows Defender下载并安装更新。

单击更新并等待 Windows Defender 下载并安装更新

4. 重新启动您的 PC 以保存更改。

方法 2： ^{(Method 2: )}暂时禁用第 3 方防病毒软件^{(Temporarily Disable 3rd party Antivirus)}

1. 右键单击系统托盘中的防病毒程序图标^{( Antivirus Program icon)}并选择禁用。^(Disable.)

禁用自动保护以禁用您的防病毒软件

2. 接下来，选择防病毒软件将保持禁用的时间范围。^{( Antivirus will remain disabled.)}

选择直到禁用防病毒软件的持续时间

注意：^(Note:)选择尽可能短的时间，例如 15 分钟或 30 分钟。

3. 完成后，再次尝试运行Windows Defender并查看是否能够修复 Windows Defender 更新失败并出现错误 0x80070643。^{(Fix Windows Defender Update fails with error 0x80070643.)}

方法 3：运行 SFC 和 CHKDSK^{(Method 3: Run SFC and CHKDSK)}

1.打开命令提示符^{(Command Prompt)}。用户可以通过搜索“cmd”然后按 Enter 来执行此步骤。

打开命令提示符。用户可以通过搜索“cmd”然后按 Enter 来执行此步骤。

2.现在在cmd中输入以下内容并回车：

Sfc /scannow
sfc /scannow /offbootdir=c:\ /offwindir=c:\windows

SFC 立即扫描命令提示符

3.等待^(Wait)上述过程完成，完成后，重新启动PC。

4. 接下来，运行 CHKDSK 来修复文件系统错误^{(CHKDSK to Fix File System Errors)}。

5. 让上述过程完成并再次重新启动您的 PC 以保存更改。

方法 4：执行干净启动^{(Method 4: Perform Clean Boot)}

有时，第 3 方软件可能与Windows发生冲突并可能导致问题。要修复 Windows Defender 更新失败并出现错误 0x80070643 问题^{(Fix Windows Defender Update fails with error 0x80070643 Issue)}，您需要在 PC 上执行干净启动^{(perform a clean boot)} 并逐步诊断问题。

方法 5：使用命令提示符更新 Windows Defender^{(Method 5: Use the command prompt to update Windows Defender)}

1.打开命令提示符^{(Command Prompt)}。用户可以通过搜索“cmd”然后按 Enter 来执行此步骤。

2. 在 cmd 中输入^(Enter)以下命令并在每个命令后按 Enter：

“%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe” -RemoveDefinitions -All

“%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe” -SignatureUpdate

使用命令提示符更新 Windows Defender | 修复 Windows Defender 更新失败并出现错误 0x80070643

3. 命令完成处理后，关闭 cmd 并重新启动 PC。

方法 6：重置 Windows 更新组件^{(Method 6: Reset Windows Updates Components)}

1.打开命令提示符^{(Command Prompt)}。用户可以通过搜索“cmd”然后按 Enter 来执行此步骤。

2. 现在键入以下命令以停止Windows 更新^{(Windows Update)} 服务^(Services)，然后在每个命令后按 Enter ：^(Enter)

网络停止 wuauserv
网络停止 cryptSvc
网络停止位
网络停止 msiserver

停止 Windows 更新服务 wuauserv cryptSvc bits msiserver

3. 接下来，键入以下命令以重命名SoftwareDistribution 文件夹^{(SoftwareDistribution Folder)}，然后按 Enter^(Enter)：

ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
ren C:\Windows\System32\catroot2 catroot2.old

重命名 SoftwareDistribution 文件夹

4. 最后，键入以下命令以启动Windows 更新^{(Windows Update)} 服务^(Services)并在每个命令后按 Enter ：^(Enter)

网络启动 wuauserv
网络启动 cryptSvc
网络启动位
网络启动 msiserver

启动 Windows 更新服务 wuauserv cryptSvc bits msiserver

5. 重新启动您的 PC 以保存更改并检查是否可以 修复 Windows Defender 更新失败并出现错误 0x80070643。^{( Fix Windows Defender Update fails with error 0x80070643.)}

方法 7：运行 Windows 更新疑难解答^{(Method 7: Run Windows Update Troubleshooter)}

1. 打开控制面板，然后在右上角的搜索栏中搜索^{(Search Bar)}疑难解答，然后单击^{(Troubleshooting)}疑难解答。^{(Troubleshooting.)}

搜索疑难解答并单击疑难解答

2. 接下来，从左侧窗口的窗格中选择查看全部。^{(View all.)}

3. 然后从解决^{(Troubleshoot)}计算机问题列表中选择Windows 更新。^{(Windows Update.)}

从解决计算机问题列表中选择 Windows 更新

4. 按照屏幕上的说明运行Windows 更新疑难解答^{(Windows Update Troubleshoot)}。

Windows 更新疑难解答 | 修复 Windows Defender 更新失败并出现错误 0x80070643

5. 重新启动您的 PC，您可能能够修复 Windows Defender 更新失败并出现错误 0x80070643。^{(Fix Windows Defender Update fails with error 0x80070643.)}

受到推崇的：^{(Recommended:)}

修复 Windows 10 上的视频播放冻结^{(Fix Video Playback Freezes on Windows 10)}
修复 Windows 10 耳机没有声音的问题^{(Fix No sound from headphone in Windows 10)}
如何修复 Sec_error_expired_certificate^{(How to Fix Sec_error_expired_certificate)}
修复 Windows 10 上 Internet Explorer 中缺少的收藏夹^{(Fix Favorites missing in Internet Explorer on Windows 10)}

就是这样，您已成功修复 Windows Defender 更新失败并出现错误 0x80070643^{(Fix Windows Defender Update fails with error 0x80070643)}，但如果您对这篇文章仍有任何疑问，请随时在评论部分询问。

Fix Windows Defender Update fails with error 0x80070643

If you are trying to update Windows Defender using Windоws Update, then you mаy have to face error code 0x80070643 which accompanieѕ the error message “Definition Update fоr Windows Defender – Error 0x80070643”. The error code typically means that a fatal error has occurred during the installation, but there is no partiсular cause associated with this error. Also, the error doeѕn’t really provide much information, but Microsoft has acknowledged the issue, and thіs is their official statement:

Thank you for your patience regarding Windows Defender update error 0x80070643. Read our guide on How to fix Windows 10 Update or Activation Error Code 0xc004f075 here.. Read our guide on How to fix Windows 10 Update or Activation Error Code 0xc004f075 here.. We are aware of the issue and trying to roll out mitigation as soon as possible. Meanwhile, to get your machine back to a protected state, you can manually download and apply the latest Definition Update.

Now there are few fixes or workaround the problem, but you need to try them all because what may work for one user doesn’t necessarily mean that it will work for another user. So without wasting any time let’s see how to Fix Windows Defender Update fails with error 0x80070643 with the help of below-listed troubleshooting guide. Also read How to Perform Windows Defender Definition Update here.. Also read How to Perform Windows Defender Definition Update here..

Fix Windows Defender Update fails with error 0x80070643

Make sure to create a restore point just in case something goes wrong.

Method 1: Update Windows Defender Manually

1. Press Windows Key + Q to bring up Windows Search, type Windows Defender and click on the search result.

Type Windows Defender and click on the search result | Fix Windows Defender Update fails with error 0x80070643

2. Navigate to Update > Update definitions.

3. Click on Update and wait for Windows Defender to download and install updates.

Click on Update and wait for Windows Defender to download and install updates

4. Reboot your PC to save changes.

Method 2: Temporarily Disable 3rd party Antivirus

1. Right-click on the Antivirus Program icon from the system tray and select Disable.

Disable auto-protect to disable your Antivirus

2. Next, select the time frame for which the Antivirus will remain disabled.

select the duration until when the antivirus will be disabled

Note: Choose the smallest amount of time possible, for example, 15 minutes or 30 minutes.

3. Once is done, again try to run Windows Defender and see if you’re able to Fix Windows Defender Update fails with error 0x80070643.

Method 3: Run SFC and CHKDSK

1. Open Command Prompt. The user can perform this step by searching for ‘cmd’ and then press Enter.

Open Command Prompt. The user can perform this step by searching for ‘cmd’ and then press Enter.

2. Now type the following in the cmd and hit enter:

Sfc /scannow
sfc /scannow /offbootdir=c:\ /offwindir=c:\windows

SFC scan now command prompt

3. Wait for the above process to finish and once done, restart your PC.

4. Next, run CHKDSK to Fix File System Errors.

5. Let the above process complete and again reboot your PC to save changes.

Method 4: Perform Clean Boot

Sometimes 3rd party software can conflict with Windows and can cause the issue. To Fix Windows Defender Update fails with error 0x80070643 Issue, you need to perform a clean boot on your PC and diagnose the issue step by step.

Method 5: Use the command prompt to update Windows Defender

1. Open Command Prompt. The user can perform this step by searching for ‘cmd’ and then press Enter.

2. Type the following command into cmd and hit Enter after each one:

“%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe” -RemoveDefinitions -All

“%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe” -SignatureUpdate

Use the command prompt to update Windows Defender | Fix Windows Defender Update fails with error 0x80070643

3. Once the command finishes processing, close cmd and reboot your PC.

Method 6: Reset Windows Updates Components

1. Open Command Prompt. The user can perform this step by searching for ‘cmd’ and then press Enter.

2. Now type the following commands to stop Windows Update Services and then hit Enter after each one:

net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver

Stop Windows update services wuauserv cryptSvc bits msiserver

3. Next, type the following command to rename SoftwareDistribution Folder and then hit Enter:

ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
ren C:\Windows\System32\catroot2 catroot2.old

Rename SoftwareDistribution Folder

4. Finally, type the following command to start Windows Update Services and hit Enter after each one:

net start wuauserv
net start cryptSvc
net start bits
net start msiserver

Start Windows update services wuauserv cryptSvc bits msiserver

5. Reboot your PC to save changes and check if you can Fix Windows Defender Update fails with error 0x80070643.

Method 7: Run Windows Update Troubleshooter

1. Open control panel and then search Troubleshooting in the Search Bar on the top right side and click on Troubleshooting.

Search Troubleshoot and click on Troubleshooting

2. Next, from the left window, pane select View all.

3. Then from the Troubleshoot computer problems list select Windows Update.

From the Troubleshoot computer problems list select Windows Update

4. Follow on-screen instruction and let the Windows Update Troubleshoot run.

Windows Update Troubleshooter | Fix Windows Defender Update fails with error 0x80070643

5. Restart your PC, and you may be able to Fix Windows Defender Update fails with error 0x80070643.

Recommended:

That’s it you have successfully Fix Windows Defender Update fails with error 0x80070643 but if you still have any questions regarding this post then feel free to ask them in the comment’s section.

鑫赵

About the author

我是一名软件工程师，拥有 Xbox Explorer、Microsoft Excel 和 Windows 8.1 Explorer 方面的经验。业余时间，我喜欢玩电子游戏和看电视。我拥有犹他大学的学位，目前在一家国际公司担任软件工程师。

修复 Windows Defender 更新失败并出现错误 0x80070643

修复 Windows Defender 更新(Fix Windows Defender Update)失败并出现错误 0x80070643

方法 1：手动更新 Windows Defender(Method 1: Update Windows Defender Manually)

方法 2： (Method 2: )暂时禁用第 3 方防病毒软件(Temporarily Disable 3rd party Antivirus)

方法 3：运行 SFC 和 CHKDSK(Method 3: Run SFC and CHKDSK)

方法 4：执行干净启动(Method 4: Perform Clean Boot)

方法 5：使用命令提示符更新 Windows Defender(Method 5: Use the command prompt to update Windows Defender)

方法 6：重置 Windows 更新组件(Method 6: Reset Windows Updates Components)

方法 7：运行 Windows 更新疑难解答(Method 7: Run Windows Update Troubleshooter)

Fix Windows Defender Update fails with error 0x80070643

Fix Windows Defender Update fails with error 0x80070643

Method 1: Update Windows Defender Manually

Method 2: Temporarily Disable 3rd party Antivirus

Method 3: Run SFC and CHKDSK

Method 4: Perform Clean Boot

Method 5: Use the command prompt to update Windows Defender

Method 6: Reset Windows Updates Components

Method 7: Run Windows Update Troubleshooter

鑫 赵

About the author

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修复 Windows Defender 更新^{(Fix Windows Defender Update)}失败并出现错误 0x80070643

方法 1：手动更新 Windows Defender^{(Method 1: Update Windows Defender Manually)}

方法 2： ^{(Method 2: )}暂时禁用第 3 方防病毒软件^{(Temporarily Disable 3rd party Antivirus)}

方法 3：运行 SFC 和 CHKDSK^{(Method 3: Run SFC and CHKDSK)}

方法 4：执行干净启动^{(Method 4: Perform Clean Boot)}

方法 5：使用命令提示符更新 Windows Defender^{(Method 5: Use the command prompt to update Windows Defender)}

方法 6：重置 Windows 更新组件^{(Method 6: Reset Windows Updates Components)}

方法 7：运行 Windows 更新疑难解答^{(Method 7: Run Windows Update Troubleshooter)}

鑫赵