Fix Windows Update Error Code ‘0x80070643’

The majority of Windows OS users have experienced a Windows update error. The error happens while the window’s defender is being updated. The notice “Definition Update for Windows Defender – Error 0x80070643” appears on the screen.

The problem prevents the defence from being updated. As a result, it denotes the detection of a flaw in the installation procedure. There may be relevant Windows downloads, but they are constantly interrupted by pop-ups, preventing them from installing properly and entirely on the computer system.

Windows Update Error Code 0x80070643: 12 Solutions

The error code 0x80070643 can be produced by some of the previous antivirus program’s undeleted files remaining on your computer, or by some corrupted files saved in your computer system. As a result, in order to resolve this issue, many users seek out suitable and appropriate solutions to the fault that has occurred in their computer system.

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Because there are numerous solutions to a variety of issues, it is vital to first determine the source of the error before implementing a specific method in your computer system.

So, before you go forward and be fully prepared for the reason and conduct thorough investigation, we’ve included several strategies below that may help you solve the problem. Take a peek at it.

Method 1: Restart Your Computer

This may appear to be a simple and pointless chore to you. However, this method can occasionally swiftly answer a large number of problems. So, if you’re having severe troubles with coding errors or anything else, you should try this way first.

Simply restart your computer and reinstall the programme you require. Because the previous installation may necessitate restarting the computer before proceeding to the next step.

Method 2: Disable Antivirus Program

There is a chance that the antivirus product you have installed on your computer will conflict with the Windows update you want to install. To resolve the issue, turn off your antivirus software first, then check to see if the problem has been resolved.

After that, go to Windows Update and see if your machine can be updated right now. After completing the task, the error code 0x80070643 may vanish. To disable the antivirus, follow these steps:

Step 1: To begin, right-click on the antivirus icon on your computer and pick Disable from the menu.

Step 2: Choose the time period for which you want the antivirus to be disabled. 15 to 30 minutes is the suggested time duration.

Step 3: Open the Windows Defender programme. Check to see if the warning Windows Defender Update Fails with Error Code 0x80070643 is still visible.

Method 3: Update to the Latest.NET Framework Version

Installing the most recent system updates relies heavily on the.NET framework. So, if you don’t have.NET framework installed in your computer system or if it is obsolete, download the newest version from Microsoft and install it in your computer system.

To get the.NET framework, follow these instructions:

Step 1: First, browse to the.NET framework’s official website.

Step 2: Next, choose the most recent.NET framework version.

If necessary, you can also download older versions of the.NET framework once it has been downloaded.

Step 3: Select the download option and wait for the procedure to start. After following the on-screen directions, open the installed file on your PC or laptop to complete the installation.

Step 4: Finally, after you’ve finished downloading the programme, check for Windows updates and see whether you can upgrade Windows on your computer system.

Method 4: Restart the Windows Installer Service on your computer

The appearance of error code 0x80070643 is caused by some improper configurations in the computer system’s Windows install service. You can try reinstalling the Windows Installer service on your computer. Follow the steps below to complete this process:

Step 1: To begin, hit Win + R on your keyboard simultaneously.

Step 2: Next, type “services.msc” and press Enter to launch the service Windows on your computer.

Step 3: Finally, select the Windows Installer option and restart the computer.

Step 4: Finally, check to see if your issue has been resolved.

Method 5: Update Windows Defender on Your Computer Manually

Step 1: To begin, press the Windows + Q buttons on your keyboard simultaneously. After that, look for Windows Defender.

Step 2: Next, go to Protection zones and select Virus & Threat Protection.

Step 3: Finally, select Virus & Threat Protection Updates from the drop-down menu. Now select the Check for Updates option. It will then take some time for your computer system to obtain the most recent updates available.

Step 4: Finally, reboot your computer and preserve the modifications you’ve made to your system.

Optional method:

You may also update Windows defender using the command prompt on your machine. The steps to using this approach are as follows:

Step 1: Press the Windows + X keys at the same time. Then select Command Prompt from the drop-down menu (Admin).

Step 2: Then, in cmd, type the following commands one by one, pressing Enter after each one:

” percent PROGRAMFILES percent Windows DefenderMpCmdRun.exe” – Remove Definitions -All ” percent PROGRAMFILES percent Windows DefenderMpCmdRun.exe” – Remove Definitions -All ” percent PROGRAMFILES percent Windows DefenderMpCmdRun.exe” – Update Signatures

After you’ve entered the command, the procedure will begin.

Step 3: Finally, exit cmd and restart your computer.

Method 6: On your PC, run Scan Now or SFC.

Errors are caused by the presence of corrupt or harmful files in your computer system. As a result of this, Windows may fail to update, resulting in an error code.

In this scenario, the SFC scan is a valuable programme for scanning all corrupted files in your computer system and replacing them with the correct files. Follow these steps to run an SFC scan on your computer:

Step 1: To begin, hold down the Windows key and the X key at the same time. Then, from the menu, choose Command Prompt (Admin).

Step 2: In the command prompt, write “SFC /scan now” and click enter. Allow some time for the scanning to finish.

Step 3: Finally, it is the time to install system updates. If it is, the 0x80070643 fault has been resolved.

Method 7: Use the Troubleshooter

Use the procedures listed below to troubleshoot:

Step 1: To begin, go to the start menu and type “troubleshoot” into the search field. The option to troubleshoot will appear.

Step 2: Expand the Windows Update option and select Run the troubleshooter from the drop-down menu.

Then, after reading the on-screen directions, perform the Windows update troubleshoots.

Step 3: Restart your computer and see if the issue code 0x80070643 has been resolved.

Method 8: Make Use Of The System Restore Option

The system restorations feature will return the Windows updating system to its previous state, making it reliable and functional. The procedure is simple to follow and does not require any data or information. However, any drivers or apps you installed after the restoration point may be destroyed.

Create a system restore point if you see the error code 0x80070643 on your computer screens during the installation of Windows Update, and then use your computer without any errors.

Method 9: Reset the Windows Update Components to Resolve the Problem

Step 1: To begin, hold down the Windows key and the X key at the same time. Select the command prompt by clicking on it (admin).

Step 2: Then, to stop Windows Update Services, execute the commands below and press Enter after each one:

wuauserv wuauserv wuauserv wuauserv
cryptSvc should be stopped on the network.
halt bits on the internet
net msiserver halt

Step 3: To rename the Software Distribution Folder, type the instructions listed below. After each one, press the “Enter” key:

WindowsSoftwareDistribution/Ren C/Ren C/Ren C/Ren C/Ren C/Ren SoftwareDistribution.old C:WindowsSystem32Catroot2 catroot2 Ren C:WindowsSystem32Catroot2

Step 4: Then, to start the Windows Update Services, type the commands supplied to you. After inputting each command, press the “Enter” key:

wuauserv wuauserv wuauserv wuauserv
net start msiserver net start bits

Step 5: Finally, restart your computer system to save all of your saved changes. Check to see if the error 0x80070643 is still present.

Method 10: Uninstall Windows Defender Update

The concept of using Windows 10’s system restore is ambiguous. However, frequent resetting of the computer system is inconvenient for users. If you are experiencing the same issues and seeing the problem code 0x80070643 on your computer screen, please contact us.

Then you should use the process of uninstalling Windows Defender and returning to the previous state of the window. To do so, follow the instructions below:

Step 1: To open the Run window, press the Windows + R keys at the same time.

Then, to open Programs and Features, type “appwiz.cpl” and press Enter.

Step 2: Next, on the left side of your screen, click the View Installed Updates icon.

Step 3: Go to Microsoft Windows and scroll down. Then, on the Windows Defender or KB4054517 Update, which is the source of error number 0x80070643, right-click.

Step 4: Finally, click Uninstall and restart your computer to see if the problem has been solved.

Method 11: Using Administrative Permissions to Update

To install the updates on your computer, you’ll need administrator permission. So, if you haven’t created an account on your computer yet and are working as a guest or with limited privileges, join up on your computer first.

If your computer is part of a domain that you aren’t aware of, contact your system administrator for assistance.

Method 12: SubInACL Tool

Many Windows XP or Windows Vista users are aware of an issue in the.NET Framework 2.0 that remains as a result of erroneous access control list permissions on registry hives, preventing some apps from being installed.

In that instance, the SublnACL programme is used to resolve the problem by correcting the faulty file registry permissions that are required for installation. Setups based on MSI.
Follow the steps below to put these methods into action:

Step 1: Download and install the SubInACL utility on your machine. This tool will be installed in the following locations:

Windows Resource Kits (C:ProgramFiles)


Step 2: Next, open the file and paste the code into the notepad document.

Then go to the file option and “Save As” to save the file.

Step 3: Rename it to reset.cmd later. Finally, set the file type to All Files. Then right-click on the Script and select Run as administrator from the context menu.

Step 4: Wait for the reset to complete.

The cmd script is finished. Try installing the software that previously failed to install on your machine.

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Finally, we’d like to point out that all of the solutions listed above are the best and most appropriate for your computer system when it comes to resolving the Windows update error. Each method includes all of the listed techniques and is associated with a certain cause.

If you are unable to classify the sort of error you are experiencing, you should first conduct research to determine the cause, and then use the appropriate method. To make the procedure easier, we’ve supplied not only a few options, but a variety of options for resolving the problem on your computer.

However, there is a potential that you will not be able to find a lasting solution, but you will have a better chance of success if you use these strategies. So, before you go looking for a method and trying to follow it on your computer, read the steps first and then carefully implement them. We are hopeful that we will be able to find a solution to your problem.

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