This guide will help you fix Error 0x80070643. This error most commonly occurs when you try to update Windows 10 on your PC.

Nowadays, users everywhere around the Globe share that many of them have allegedly experienced error. 0x80070643 This issue is very common and happens to a lot of operations. It may occur when you try to install a Windows update, Microsoft Security Essentials or other various programs.  

In the article below we have pointed out several possible solutions to your issue. Please, try performing them one by one. Hopefully, some of them will help you solve your problem. In case none of them prove helpful, let us know and provide us with the details of your particular case. We will do our best to resolve your particular case. Also, if you have come across another possible solution, different from the following ones, we kindly ask you to inform us. In this way we will be able to add it to our list and help more troubled users.

Error 0x80070643 in Windows 10 Fix

The Guide

Any Windows user is aware of the fact that normally when Microsoft releases any new update, the Windows version on their machines has been programmed to check and install such updates automatically (only if the PC that needs updating has Internet access). It is very important to apply all the newest updates in order to enhance the performance of your machine and to improve your OS features. Updates could also be applied manually, once downloaded from the official provider.

Nevertheless, sometimes updating your OS may not go smoothly. The message that you may receive in case an update fails to be applied could be:

“0x80070643-Unable to install Windows Update:”

The potential origins of such an update failure could be very diverse, but the most common ones are:

  • The .NET framework on your computer could be experiencing issues.
  • The data about the MS 2003 components might be corrupted.
  • In case your OS is Windows 10 and you want to apply the KB3122947 update, it is possible that you notice a similar error code: “Update for Windows 10 Version 1511 for x64-based Systems (KB3122947) – Error 0x80070643”.
  • Maybe you are unable to apply the latest system updates.
  • Some System files or registry might have been corrupted or damaged in some way.
  • The Windows Update app is incapable of accessing particular user data.
  • Your PC is suffering from a malware infection.
  • The MSI software update registration or the .NET Framework installation has been damaged.
  • The Microsoft Office Source Engine (Ose.exe) is either disabled or corrupted.
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#1: Updating or fixing the Windows .NET Framework could help

.NET Framework is an essential component of the software installation process and the application of system updates for all Windows types. This feature should always be up-to-date and upgraded to the latest and the best version. In this way all the other software on your PC could be deployed, built, or simply functioning properly. The steps below will help you ensure that your system is upgraded with the newest version of .NET Framework.

– Terminate all software currently in use. Hit the “Start” button. From there go to Control Panel. From there select  Programs and open “Program and Features”.

– From the group of programs that you notice, find the Microsoft .NET Framework 4 Client Profile. Click on it.  Select the tab Uninstall/Change (or Change/Remove for Windows XP users).

– A window will appear. Choose Repair .NET Framework 4 Client Profile to its original state. After that hit the Next button.

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Choose Finish if the process of repairing process has ended. Restart your system.

At that point you should check whether the issue has disappeared by trying to install Windows updates again. If this possible solution hasn’t helped you, proceed with the ones below.

#2: Updating your PC manually might help

This possible solution has proven to help in many cases. Even if your computer skills are not close to professional, you should be able to do the task.

 – Enter Control Panel. Find the System and Security feature there. Proceed with choosing  Windows Update. Select  the  Check for Updates option and seek some available updates for your PC.

As soon as the necessary updates are detected, select “Install updates”. Doing that should do the trick and you should have solved your problem.

#3: Try rebooting the Office Source Engine (OSE) service

This solution will work if you have Microsoft Office 2003 installed on your PC and it’s necessary that you update some of its components. In this case you will see the Windows update error code 0x80070643 and its origin will be an issue with the Ose.exe file. Here comes a possible remedy.

– Hit the Windows and the R keys at the same time. This will load the Run box. Once there, enter services.msc in the search box. Press Enter.

– A list will show. Look for the Office Source Engine and click on it.

– The Startup type needs to be altered. In case you have disabled it, select to run it manually. For that purpose, click twice on it, and choose the startup type as Manual. Finish this step by hitting OK.

After that, check if you are able to install Office update.

In case the instructions above are not useful in your case, you might need to remove and install Office 2003 again.

#4: Sometimes fixing corrupted system files with SFC /scannow could be what you need for resolving this error

The majority of users have the habit of installing, updating, uninstalling and reinstalling various programs on their machines. What’s more, the system itself will perform some different tasks and operations.

Normally, during all these processes there will be some damaged or corrupted files. They may even start causing some problems and bothering the affected users. That’s why it is always beneficial to scan and look for such files. Here you may find the System file checker very helpful. This tool is an expert at searching for and detecting  corrupted files, as well as at exchanging them for the correct ones. For that purpose:

* Enter the Command Prompt as an administrator.

* Type sfc/scannow. Then continue by pressing Enter. After that a scan will begin and your corrupted system files will be fixed. Be patient until this process is completed. If the repair work has been performed without any signs of errors, check if you can apply the Windows update once more.
Please remember that sometimes file repair is not possible and you may need to complete a system restore.

#5: Solve any ongoing Registry issues

Some Windows 10 users might experience the 0x80070643 error in this form: “Update for Windows 10 for x64-based Systems (KB3081704) – Error 0x80070643”. Fortunately that can be fixed by going to registry and performing some basic operations.

*Enter Registry Editor. Select the Start button. Enter regedit in the search box. Again hit the Enter key. In case you are prompted by UAC {User Account Control}, press the YES button.

*Browse the registry using  the path below:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\BackupRestore\FilesNotToBackup.
If FilesNotToBackup exists,

* Exit the editor.

Attention: For manually adding the “FilesNotToBackup”, right-click on Backup Restore. Choose New. Then continue with “Key”. After that write FilesNotToBackup and push Enter. Select the Start button so as to write services.msc . Again press Enter. Look for and find the background Intelligent Transfer Service. Double-click on it. Then proceed with hitting Start under the General tab. Choose Ok to authorize the setting. If you have set it to Start already, choose Stop. After that select Start again. You should be done now!