- The 0x80070643 Windows 11 error can arise because of corrupted Windows Defender definitions, .NET Framework, or update components.
- Some users might need to repair Windows update components to fix it in no time.
- Updating security signatures is another potential solution to take into consideration.
- If the 0x80070643 error arises during the Windows 11 installation, repairing .NET Framework might also help.
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Microsoft might have recently released Windows 11, but when it comes to updating errors, some things never change. Users have already posted on forums about the update error 0x80070643 in Windows 11.
They had to fix the very same error in Windows 10 in the past, which can also occur on Microsoft’s latest desktop platform. That issue arises for some users when they try to install new patch updates via Settings. Windows updates fail to install because of error 0x80070643.
So, the error 0x80070643 is yet one of the many Windows update install issues. However, there are quite a few ways you can feasibly fix it as soon as possible.
What causes the update error 0x80070643 in Windows 11?
Before trying to get rid of the update error 0x80070643, it’s worth considering the more likely causes of the issue:
- Third-party antivirus software conflicts: Antivirus software might be conflicting with the Windows Update service
- Missing, outdated, or corrupted .NET Framework installation: Updates fail to install because .NET Framework is corrupted or missing or you might need to install a newer version
- Corrupted system files: You might have to repair corrupted system files causing the issue
- Damaged Windows Update components: Some Windows Update components might be corrupted or incorrectly configured
- Corrupted Windows Defender definitions: Error 0x80070643 can also arise because of corrupted Windows Defender definitions
To solve the error 0x80070643 in Windows 11, you must apply resolutions that can feasibly remedy those causes. Give these potential fixes a try right away.
How can I fix the error 0x80070643 in Windows 11?
1. Run the Windows Update troubleshooter
2. Run a system file scan
sfc /scannow
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3. Install the latest .Net Framework 4.8
4. Repair .NET Framework
NOTE
This potential fix is recommended if the latest .NET Framework version is already installed on your desktop or laptop.
5. Temporarily turn off third-party antivirus software
Disable any third-party antivirus utility installed on your PC before you try installing the latest Windows updates in Settings.
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The way you can usually do that is to right-click the antivirus utility’s system tray icon and select the Disable option on the context menu. Choose to disable it for an hour at least.
6. Change the SoftwareDistribution subfolder name
net stop wuauserv
net stop bits
rename c:\windows\SoftwareDistribution SoftwareDistribution.bak
net start wuauserv
net start bits
7. Reset the Catroot2 folder
net stop cryptsvc
md %systemroot%\system32\catroot2.old
xcopy %systemroot%\system32\catroot2 %systemroot%\system32\catroot2.old /s
C:\Windows\System32\catroot2
net start cryptsvc
8. Update Windows Defender’s signatures
NOTE
This potential resolution is especially recommended when error 0x8007064 occurs for Windows Defender updates.
“%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe” -RemoveDefinitions -All
“%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe” -SignatureUpdate
“%ProgramFiles%\Windows Defender\MPCMDRUN.exe” -SignatureUpdate -MMPC
9. Clean-boot Windows 11
msconfig
NOTE
To restore the original boot settings, simply select Load startup items on MSConfig’s General tab. You can restore third-party services by pressing the Enable all button. Then click Apply to save the restored boot configuration.
Can I manually install the updates error 0x80070643 arises for?
You can manually install those updates from the Microsoft Update Catalog. The official website includes a repository of Windows updates from which users can manually download and then install updates.
Read more about this topic
Who can I contact about fixing error 0x80070643?
Do not hesitate to contact Microsoft’s support service if you need more resolutions. The Contact Microsoft Support page includes a text box you can fill out to describe the error. Then you can get in touch with the service in your browser by clicking the Get Help and Contact Support buttons.
Alternatively, you can discuss error 0x80070643 on Microsoft’s community forum for Windows platforms. Microsoft’s agents on that forum are readily available to advise on how to fix Windows errors. Click that forum’s Ask a question link to submit a post there.
However, users have confirmed the potential resolutions above to fix the error 0x80070643. Therefore, it’s likely that those solutions will resolve the issue for the majority of users.
Yet, we can’t promise that the above fixes are 100 percent guaranteed. If they’re not enough, resetting Windows 11 might also be worth a shot. Check out our guide on how to reset Windows 11 to its factory settings for further guidelines.
Some third-party repair utilities can also fix a wide range of Windows update issues, such as error 0x80070643. These best Windows update repair tools are worthy of your attention as well.
Let us know your opinion on this topic in the comments area below.
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