Fixing Windows Update Install Error 0x80070643: Step by Step

Windows updates are crucial for maintaining the security, functionality, and performance of your computer. However, sometimes these updates can encounter issues, such as the notorious download error 0x80070643. If you’ve experienced this error, you’re not alone. This comprehensive, step-by-step guide aims to help you resolve the 0x80070643 error code and get your updates back on track.

What is the 0x80070643 Error Code?

Before diving into the solutions, it’s essential to understand what the error code 0x80070643 signifies. The 0x80070643 error is a general Windows Update error, often related to problems with the .NET Framework, software installations, or system files that have become corrupted. It prevents the update from being installed and can be frustrating to resolve without a clear plan.

Common Causes of the 0x80070643 Error

  1. Corrupted .NET Framework: One of the primary reasons for encountering this error is a corrupted .NET Framework installation.
  2. Incomplete Software Installation: Sometimes, incomplete or failed software installations can lead to this error.
  3. Corrupted System Files: Damaged or missing system files can also prevent updates from being installed.
  4. Antivirus Interference: Over-aggressive antivirus software can sometimes block updates.
  5. Registry Issues: Corrupt registry entries may also cause this error.

Step-by-Step Solutions to Fix the 0x80070643 Error Code

Below are the comprehensive solutions to resolve the Windows update 0x80070643 error. Follow each step carefully to ensure a complete resolution.

Step 1: Restart Your Computer

Sometimes, a simple restart can resolve temporary issues interfering with the update process. Reboot your computer and try rerunning the Windows Update.

Step 2: Update .NET Framework

  1. Check for .NET Framework Updates:
    • Open the Control Panel.
    • Go to Programs and Features.
    • Select Turn Windows features on or off.
    • Check if the latest versions of the .NET Framework are installed and enabled.
  2. Repair the .NET Framework:
    • Download the .NET Framework Repair Tool directly from the official Microsoft website.
    • Run the tool and follow the on-screen instructions to detect and repair issues.

Step 3: Run the Windows Update Troubleshooter

  1. Access the Troubleshooter:
    • Go to Settings > Update & Security > Troubleshoot.
    • Click on Additional troubleshooters.
  2. Run the Troubleshooter:
    • Select Windows Update and click on Run the troubleshooter.
    • Follow the prompts and apply any fixes suggested by the troubleshooter.

Read Also: How to Debloat Windows 11 for Maximum Performance and Speed

Step 4: Check and Repair System Files

Corrupt system files can be a significant cause of the 0x80070643 error. Use the System File Checker (SFC) and Deployment Imaging Service and Management Tool (DISM) to repair these files.

  1. Run SFC Scan:
    • Open the Command Prompt as an administrator.
    • Type sfc /scannow and press Enter.
    • Wait for the scan to complete and follow any prompts to repair files.
  2. Run DISM Tool:
    • In the Command Prompt, type DISM /Online /Cleanup-Image /RestoreHealth and press Enter.
    • Allow the process to complete, then reboot your laptop or desktop PC.

Step 5: Temporarily Disable Antivirus Software

Sometimes, antivirus software can interfere with the update process, leading to the 0x80070643 error. Temporarily disable your antivirus software and attempt the update again. Remember to re-enable it afterward.

Step 6: Manually Install the Update

  1. Download the Update:
    • Visit the Microsoft Update Catalog.
    • Search for the specific update that’s failing to install by typing the update code (e.g., KBXXXXXXX).
  2. Install the Update:
    • Download the relevant update file for your system.
    • Run the installer and observe the on-screen directions to manually install the update.

Step 7: Reset Windows Update Components

Resetting the Windows Update components can often resolve persistent errors.

  1. Stop Windows Update Services:
    • Open the Command Prompt as an administrator.
    • Type and execute the following commands:textnet stop wuauserv net stop cryptSvc net stop bits net stop msiserver
  2. Rename Software Distribution Folder:
    • In the Command Prompt, type and execute the following commands:textren C:\Windows\SoftwareDistribution SoftwareDistribution.old ren C:\Windows\System32\catroot2 Catroot2.old
  1. Restart Windows Update Services:
    • After renaming the folders, start the Windows Update services again by typing the following commands in the Command Prompt:textnet start wuauserv net start cryptSvc net start bits net start msiserver
    • Close the Command Prompt and reboot your Laptop or Desktop PC.

This process resets the Windows Update components and may resolve the download error 0x80070643.

Step 8: Clear and Reset the Windows Update Cache

Clearing the Windows Update cache can sometimes fix issues related to download error – 0x80070643.

  1. Stop the Windows Update Service:
    • Open the Command Prompt as an administrator.
    • Execute net stop wuauserv to stop the Windows Update service.
  2. Delete Cache Files:
    • Navigate to C:\Windows\SoftwareDistribution\Download and delete all files in the folder.
  3. Start the Windows Update Service:
    • In the Command Prompt, execute net start wuauserv to restart the Windows Update service.
  4. Restart Your Computer:
    • Reboot your system to apply the changes.

Step 9: Inspect for Misconfigured Windows Update Settings

Sometimes, improper settings can lead to the 0x80070643 error. Ensure your Windows Update settings are correctly configured.

  1. Open Settings:
    • Go to Settings > Update & Security > Windows Update.
  2. Check Update Settings:
    • Ensure that your update settings are set to download and install updates automatically.
  3. Advanced Options:
    • Click on Advanced options and ensure that settings like Receive updates for other Microsoft products and Delivery Optimization are configured correctly.

Step 10: Use the Microsoft Update Assistant

If manual installation and other methods fail, using the Microsoft Update Assistant can help.

  1. Download the Update Assistant:
    • Visit the Microsoft website and download the Windows Update Assistant.
  2. Run the Update Assistant:
    • Execute the tool and follow the on-screen instructions to update your system to the latest version. This can resolve the 0x80070643 error code by addressing deeper system issues.

Step 11: Perform a Clean Boot

Performing a clean boot can help identify if background programs or services are causing the update issue.

  1. Open System Configuration:
    • Press Win + R, type msconfig, and press Enter.
  2. Selective Startup:
    • In the General tab, choose Selective Startup and uncheck Load startup items.
  3. Disable Services:
    • Go to the Services option & then check Hide all Microsoft services.
    • Click on Disable all.
  4. Restart Your Computer:
    • Reboot your Laptop or personal computer and strive the update again.

If the update succeeds, you can identify and manage the interfering services or programs.

Step 12: Update Windows Installer

The Windows Installer itself may cause issues. Updating the installer can settle such conflicts.

  1. Download Windows Installer:
    • Visit the Microsoft Download Center and download the latest version of the Windows Installer.
  2. Install and Restart:
    • Install the update and rebootyour laptop or personal computer to apply changes.

Step 13: Reinstall Problematic Software

If the error is related to a specific software installation, reinstalling the problematic software could fix the issue.

  1. Uninstall the Software:
    • Open Control Panel > Programs and Features.
    • Find and uninstall the problematic software.
  2. Reinstall the Software:
    • Download the latest version from the software manufacturer and reinstall it.

This method can resolve issues related to incomplete or corrupt software installations causing the 0x80070643 error.

Step 14: Perform a System Restore

If all else fails, performing a system restore can revert your system to a previous state before the error occurred.

  1. Open System Restore:
    • Go to Control Panel > System and Security > System.
    • Select System Protection and click on System Restore.
  2. Choose a Restore Point:
    • Select a restore point dated before you first encountered the 0x80070643 error.
    • Comply the prompts to complete the restore process.

A system restore can fix deeply embedded issues affecting Windows Updates.


Addressing the 0x80070643 error code can be challenging, but the steps outlined in this guide aim to provide comprehensive solutions. From repairing the .NET Framework to resetting Windows Update components and performing a system restore, each method targets a potential cause of the error.

Remember, maintaining your system with regular updates and checks can help prevent such issues from occurring in the future. By following the step-by-step solutions in this guide, you should be able to resolve the download error 0x80070643 and successfully install the necessary Windows updates.

Monica J. White

Monica J. White is a tech writer for, where she covers the latest advancements in computing, digital cameras, mobile devices, apps, and virtual reality. You can reach her at

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