13 Ways to Fix Windows Update Error Code 0x80070643 [Quick Fix]

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0x80070643 is an error that has been reported by many users of Windows computer. It is an error that appears on your screens while the automatic update of your Windows takes place. The code appears with the message “Definition Update for Windows Defender – Error 0x80070643” and causes the failure of the Windows Defender Update. This error signifies that a fault has occurred during the installation process. Though the download of this update takes place properly but the error pops up and restricts the update from getting installed completely.

How to Fix Windows Update Error Code 0X80070643

The error code 0x80070643 can appear due to the presence of some of the undeleted files of previous anti-virus program or if there are corrupted files in the registries of your system.

Many users are looking for some potential methods that can help them to solve this issue by themselves. However, there are a number of ways or solutions that can be used to try to fix the error code 0x80070643. Though, different users may face this error for various reasons. So, one method which works for a particular user, might not work for the other user. So check out all the possible solutions to your problem given below and then choose which one suits your purpose and apply it to get rid of your problem.

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Method #1 Restart Your Computer

Sometimes more significant problems are solved by the most accessible solutions. Restarting your PC is one such foremost method that you should in any case that displays you error whether it is error code 0x80070643 or any other issue. So, restart your computer and install the program again as sometimes the previous installation requires a restart of your computer system.

Method #2 Disable Antivirus Program

The error code 0x80070643 can be caused due to some conflicts between the Antivirus software of your PC and the other applications or Windows Update present in your computer. In such a case, you can disable your Antivirus software temporarily to check if it can solve the issue. After this, go to the Windows Update and check if you can update your system now. Follow the steps to disable the Antivirus:

1. At First, Right-click on the icon of your Antivirus software from the system tray and click on Disable.

Disable Antivirus Protection
Disable Antivirus Protection

2. Then select the time frame for which you want to disable your Antivirus program. (It is recommended to choose the minimum time frame available there which could be 15 or 30 minutes)

3. Now run Windows Defender and check if the message Windows Defender Update fails with the error code 0x80070643 is gone or not.

Method #3 Install the Latest Version of .NET Framework

.NET Framework plays an essential role in the installation of system updates. If you don’t have .NET Framework on your PC or if its version has become outdated, then you won’t be able to install the system updates. So download and install the latest version of .NET Framework from Microsoft in your PC. Follow the steps to download .NET Framework:

1. At First, Navigate to Microsoft .NET Framework’s official website.

Microsoft .Net Framework
Microsoft .Net Framework

2. Then select the latest available version of .NET Framework.

.Net Framework Latest Version
.Net Framework Latest Version

3. Afterwards, you can also download other old versions of .NET Framework if required.

Other .NET Framework Downloads
Other .NET Framework Downloads

4. Then click on the Download button & it will take a few seconds to initiate the process.

Download in Progress
Download in Progress

5. Now open the downloaded file in your PC or laptop and follow the on-screen instructions to install it.

6. After installing this application, rerun Windows Update to check if you can install the system updates now.

Method #4 Restart Windows Installer Service in Your PC

There could be some faulty configurations in the Windows Installer Service of your system which may lead to the error code 0x80070643 to appear on your screens. Restarting the Windows Installer Service might fix the error code on your PC, follow the steps to do this:

1. At First, press Win + R keys simultaneously on your keyboard.

2. Now type “services.msc” and hit Enter key to open the Services window on your PC.

Type Services.msc
Type Services.msc

3. Next, click on the Windows Installer option and then on Restart.

Restart Windows Installer Service
Restart Windows Installer Service

4. Afterwards, check if your problem of error code 0x80070643 has been resolved or not.

Method #5 Manually Update Windows Defender in Your PC

1. At First, press Windows + Q keys at the same time and search for Windows Defender.

windows defender settings
Windows Defender Settings

2. Now, click on Virus & threat protection option under Protection areas.

Virus & Threat Protection Settings
Virus & Threat Protection Settings

3. Then click on Virus & threat protection updates button.

Virus & threat protection updates
Virus & threat protection updates

4. Now, just hit the check for updates button. It will take a few minutes to download the latest updates.

Check for Updates
Check for Updates

5. Finally, reboot your computer now and save the changes.

Alternatively, you can use Command Prompt to update Windows Defender in your system by following the steps:

1. At First, Press Windows + X keys simultaneously and choose Command Prompt (Admin).

Command Prompt (Admin)
Command Prompt (Admin)

2. Afterwards, type the command given below in cmd and press Enter key after typing each one of them:

“%PROGRAMFILES%\Windows Defender\MpCmdRun.exe” - Remove Definitions -All
“%PROGRAMFILES%\Windows Defender\MpCmdRun.exe” – SignatureUpdate
MpCmdRun.exe
MpCmdRun.exe

3. After the commands are entered, the processing will take place.

4. Finally, close cmd and reboot your system now.

Method #6 Run Scannow or SFC on Your PC

If there are any corrupted files present in your computer system, they can stop the Windows of your computer from getting updated. By using an SFC scan, you can find out the corrupted files in your system and can replace them with the right ones. Follow the steps to run scannow or sfc:

1. At First, press Windows Key + X together & choose Command Prompt (Admin) from the menu.

Command Prompt (Admin)
Command Prompt (Admin)

2. Then type “sfc / scannow” in the Command Prompt and hit Enter key.

SFC Scannow
SFC Scannow

3. Afterwards, wait for a few minutes to let your PC complete the scanning.

4. Now try to install System Updates. If it works now your problem of 0x80070643 error code has been resolved.

Method #7 Perform a Clean Boot of Your PC

The presence of third-party software and programs can conflict with Windows in your system which may result in the error code 0x80070643. In such as case, you need to perform a clean boot of your system and then check if it solves the issue.

Method #8 Use Troubleshooting

1. At First, click on Start menu and type “troubleshoot” in the search box and click on Troubleshoot option displayed.

troubleshoot
troubleshoot

2. Now, extend the Windows Update option & click on Run the troubleshooter button.

Run the troubleshooter
Run the troubleshooter

3. Afterwards, follow the on-screen instructions and run the Windows Update Troubleshoot.

4. Now, restart your computer and check if you can fix the error code 0x80070643 now.

Method #9 Use System Restore feature

It allows you to restore your Windows Operating System back to the time when it was stable and was working correctly. This step doesn’t cost you the loss of any of your data or personal information. Though, drivers and applications that you have installed after the restore point was made might get removed.

So if you are facing the error code 0x80070643 on your computer screens during the installation of Windows Update, create a system restore point and then use your computer without any error.

Method #10 Reset the Components of Windows Updates to Fix the Issue

1. At First, Press Windows + X keys and click on Command Prompt (Admin).

Command Prompt (Admin)
Command Prompt (Admin)

2. Then type the commands mentioned below and hit Enter key after each one to stop Windows Update Services:

net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
Net Stop Commands
Net Stop Commands

3. Afterwards, type the commands given below to rename the Software Distribution Folder and press Enter key after each one:

Ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
Ren C:\Windows\System32\Catroot2 catroot2.old

4. Then type the given commands to start the Windows Update Services and press Enter key after typing each command:

net start wuauserv
net start cryptSvc
net start bits
net start msiserver
Net Stop Commands
Net Stop Commands

5. At last, reboot your system to save the changes made and check if the error code 0x80070643 has been disappeared or not.

Method #11 Uninstall Windows Defender Update

People who are using Windows 10 Operating System are well aware that there is no System Restore point on Windows 10 Operating System. Also, it is frustrating to do random reboots every day. However, if you are also stuck in this situation and are facing the error code 0x80070643 then you can remove Windows Defender Update and get back to the early state of Windows by following the steps given below:

1. At First, Press Windows + R keys simultaneously to open the Run window.

2. Then type “appwiz.cpl” and hit Enter to open Programs and Features.

Type appwiz
Type appwiz

3. Afterwards, click on View Installed Updates icon displayed at the left side of your screens.

View installed updates
View installed updates

4. Now scroll down to Microsoft Windows and right click on the Windows Defender or KB4054517 Update which is the cause of the error code 0x80070643.

Uninstall KB4054517
Uninstall KB4054517

5. Finally, click on Uninstall and restart your PC to check if your issue has been resolved or not.

Method #12 Update Using Administrative Permissions

Sometimes, users need to configure the administrative permissions as some of the updates necessarily require administrative permissions to get installed. If you haven’t signed- up in your PC and are using it as a guest or as a lesser privileged account then firstly, sign in to your system. If your computer belongs to a specific domain that you are unaware of, call your system administrator to help you with this.

Method #13 Run SubInACL Tool

Users of old Windows Operating Systems like Windows Vista or Windows XP must know that there is a bug that involves .NET Framework 2.0 which occurs due to incorrect access control list permissions on registry hives that leads to causing hindrance for some applications from getting installed. However, the SubInACL tool can fix this problem by repairing the corrupt file and registry permissions that are required to install .MSI based setups. Follow the steps to try this solution:

1. At First, Download SubInACL tool & install it on your system. This tool will install into C:\ProgramFiles\Windows Resource Kits\Tools.

2. Afterwards, navigate to this file & copy-paste the code in your notepad file.

3. Then move to Navigate to File>>Save As.

Save As
Save As

4. Later, name it as reset.cmd. At last, change file type to All Files.

Reset.cmd
Reset.cmd

5. Now, right-click on the script and then on Run as Administrator.

6. Wait to let the reset.cmd script be completed and then try installing the software that failed to get installed on your PC earlier.

Conclusion

Many Windows Defender users have tried the methods mentioned above and the success rate of using these solutions is quite good. So by performing any of these methods, the users can get rid of the error code 0x80070643 and can resume their work uninterruptedly.

TIP: If none of the Methods worked for you, we strongly recommend using Reimage Repair Tool which can scan your system to fix corrupt and missing files. This works most of the time when the issue is due to system corruption. Reimage will also optimize your PC for maximum & better performance. You can download Reimage by Clicking Here

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