Last updated on April 13th, 2024 at 03:02 am

Many cases arise where users complain that while updating the Windows 10 or 11 PC, they get a Windows Update download error code 0x80070643, which gets stuck, and sometimes the PC also crashes.

Well, when I investigated this issue, I found some causes that may be the reason why you are getting this issue.

Although dealing with this kind of error is frustrating, but you do not need to worry as I’ve some fixes for you that will help you troubleshoot this problem. So, let’s check them out:

Why Did I Get The Windows Update Failed to Install With Error 0x80070643?

Before I start with how you can fix this Windows Update failed error, you need to learn why you are getting this problem so that you can try the fixes for that particular reason.

So, here are some potential causes that may cause the install error code 0x80070643:

1. Corrupted System Files
2. Conflicting Software
3. Windows Update Components Issues
4. Internet Connection Problems
5. Outdated System Drivers
6. Insufficient Disk Space
7. Windows Update Services Stopped
8. Malware or Virus Infections

How Do I Fix Windows Update Error Code 0x80070643

To fix this annoying problem, you just need to perform the fixes I’ve mentioned below, one after the other. So, let’s try them:

Fix 1: Run Windows Update Troubleshooter

There is a built-in tool that you can use to troubleshoot any problem related to Windows Update.

Yes, this troubleshooter will detect and fix the problem. However, in case you don’t know how to use it, then check out these steps:

1. Open Windows Settings. 
2. Click on System.
3. Tap on Troubleshoot.
   
   
4. Go to the Other Troubleshooter.
   
   
5. Locate the Windows Update and hit the Run button next to it.
   
   
6. That’s it. Now, just wait until the process is completed. After that, try updating your Windows 11 PC again to check whether it helps to resolve the update error 0x80070643 or not. 

Fix 2: Disable Windows Defender Temporarily

Chances are high that the Windows Defender may cause this error for you. So, you are trying to temporarily disable the Windows Defender on your Windows 10 or 11 PC to check if it is the main culprit behind the Windows Update error 0x80070643. To do this:

1. Using Windows Search, open the Windows Security.
2. Then, tap on the Virus & Threat Protection.
   
   
3. Afterwards, hit the Manage Settings option.
   
4. Then, locate and turn off the Real-Time Protection.
   
   

Fix 3: Reset Windows Update Components

In many cases, I’ve seen that due to corrupted Windows Update components this kind of error occurs.

So, possibilities are there that you may face this problem just because the update components are damaged or corrupted. You must reset your this using the steps mentioned below:

1. Initially, open CMD using admin rights. 
2. Then, execute these commands one after the other to stop Windows Update Components:
   net stop wuauserv
   net stop cryptSvc
   net stop bits
   net stop msiserver
   
   
3. Thereafter, you have to execute these commands to the SoftwareDistribution and Catroot2 folders:
   ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
   ren C:\Windows\System32\catroot2 Catroot2.old
   
   
4. Now, restart the components using these commands:
   net start wuauserv
   net start cryptSvc
   net start bits
   net start msiserver
   
   

Fix 4: Perform a Clean Boot

If resetting the Windows Update component doesn’t help you resolve the error code 0x80070643, then you must try performing a clean boot on your Windows 11 PC. To do so:

1. Open Windows Search, type in system configuration, and press Enter.
2. Select Hide all Microsoft services under the Services tab.
3. Then click Disable All.
   
   
4. On the Startup tab, click Open Task Manager.
   
   
5. To disable a third-party program, select it and click Disable.
6. You should repeat this step to disable all third-party programs and apps.
7. If the issue persists, restart your PC to enter the clean boot state.
8. In this case, you can be sure that it is a third-party app that is causing the problem.
9. Take a look at all the recent applications and programs you have installed and remove them one by one.

Fix 5: Manually Install the Update

If none of the methods worked for you to resolve the error 0x80070643 while updating Windows 10/11, then you must try installing the update manually.

To do this, you must perform these steps:

1. Go to the Microsoft Update Catalog website.
   
   
2. Thereafter, you can search for the KB number for the update you want. 
3. Then, download that according to your System Architecture (X64 or X86).
4. Finally, double-click on the file you have downloaded recently and perform the on-screen instructions to install the update manually. 

Also Read: 

1. How to Fix If Video TDR Failure Nvlddmkm.sys Turn Off Applications
2. How to Fix the Install Error 0x80070103 in Windows 11
3. How to Fix the Windows 11 Activation Error Code 0xc004f211
4. Microsoft Office Error Code 135011 | How to Fix
5. How to Fix Discord Javascript Error in Windows 11

So, that’s all I have for you on how to fix Windows Update error code 0x80070643. I hope that the fixes I’ve mentioned in this article have helped you. For more info, comment below and let us know. 

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