How to fix
Windows update error 0x80070434
on Windows

How can I fix an error 0x80070434 when updating Windows? I keep trying to install updates but it always fails with this error code. Do you have some advice for me?

Windows update errors such as 0x80070434 are a common occurrence, and most users will likely encounter such issues at some point, whether they are using the regular Windows version or are part of the Insider program.

Both scenarios can be equally frustrating, with regular users missing out on important updates that address bugs and security vulnerabilities, while Insider program participants are unable to access the latest features, which defeats the purpose of the program.

If you come across the 0x80070434 error, it may be temporary due to server problems on Microsoft's end. In such cases, it is advisable to wait a few hours or even a day to see if the issue resolves itself.

However, if the problem persists, it is crucial to take action as there is likely an underlying cause for the 0x80070434 error, such as damaged system files, hardware issues, bugged caches, or even software conflicts.

Before attempting manual solutions to fix the 0x80070434 error, we suggest running a scan with a PC repair and maintenance utility [d1]. This tool can automatically detect system corruption and repair damaged sectors, effectively resolving common Windows issues.

Fix 1. Run Windows Update troubleshooter

Let's start with the simplest fixes - run the update troubleshooter as follows:

• Type Troubleshoot in Windows search and hit Enter.
• Select Additional troubleshooters/Other troubleshooters.
• Find Windows Update from the list and select Run the troubleshooter/Run.
• Wait till the scan is finished - you will be provided with potential causes so you can proceed with fixes.
• If no suggestions were provided, proceed with the solutions below.

Fix 2. Check for file corruption

Corrupted system files are often the cause of Windows update errors. To manually fix them, you can always employ built-in tools in Windows, which you can run via elevated Command Prompt.

• Type in cmd in Windows search.
• Right-click on Command Prompt and select Run as administrator.
• User Account Control will ask you whether you allow to make changes to the system - click Yes.
• In the Command Prompt window, paste the following command and hit Enter:
  sfc /scannow
• Once the scan is complete, use the following commands and press Enter after each:
  Dism /Online /Cleanup-Image /CheckHealth
  Dism /Online /Cleanup-Image /ScanHealth
  Dism /Online /Cleanup-Image /RestoreHealth
• Restart your system.

Fix 3. Reset Windows update components

This method restarts responsible services, cleans Software Distribution folder, and resets internet-related components.

• Open Command Prompt as administrator.
• Stop the Windows Update-related services by running the following commands one at a time, pressing Enter after each one:
  net stop wuauserv
  net stop cryptSvc
  net stop bits
  net stop msiserver
• Rename the SoftwareDistribution and Catroot2 folders by running the following commands:
  ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
  ren C:\Windows\System32\catroot2 Catroot2.old
  Note: If your Windows installation is not on the C drive, replace "C" with the appropriate drive letter.
  regsvr32.exe /s atl.dll
  regsvr32.exe /s urlmon.dll
  regsvr32.exe /s mshtml.dll
  netsh winsock reset
  netsh winsock reset proxy
• Restart the Windows Update-related services by running the following commands:
  net start wuauserv
  net start cryptSvc
  net start bits
  net start msiserver
• Reboot your computer.

Fix 4. Check services

• Type in Services in Windows search and press Enter.
• Scroll down to locate Windows update.
• If it is already running, right-click and pick Restart.
• If the service is not running, double-click it, and select Automatic under the Startup type from the drop-down menu.
• Click Start, Apply, and OK.
• Perform the same steps with  Background Intelligent Transfer Service (BITS) and Cryptographic services.

Fix 5. Install the update manually

You can always install the update yourself if automatic method is not working.

• Type Updates in Windows search and hit Enter.
• Click View update history.
• Here, note down the KB number that failed to install with the error code 0x80070434.
• Go to the official Microsoft Update Catalog website.
• Type the KB number into the search bar, and press Enter or click Search.
• You will find many different versions on the update – you need to find the one that matches your PC specs and Windows version (as a home user, ignore Windows server versions).
• Right-click on Start and pick System.
• Under Device specifications, check the System type section: it should either be 64-bit or 32-bit.
• Scroll down to Windows specifications and check the Version section.
• With all this information, pick the correct version for your device.
• Go back to the Microsoft Update catalog, download the appropriate version, and install it.

Fix 6. Run Disk Cleanup

• Type Disk Cleanup in Windows search and hit Enter.
• If your Windows is installed on drive C, pick it from the list (should be by default) and press OK.
• Click Clean up system files.
• Select your main drive again and click OK.
• Here, select the largest portions of the data used - these typically include Temporary Internet Files, Windows Update, Temporary Files, Recycle Bin, Delivery Optimization Files, and others. Marking Windows Update is vital here.
• Click OK - the process should be finished shortly.

Fix 7. Use Media Creation Tool

This tool can help you fix a potentially damaged Windows installation and bring it to the latest version. Before proceeding, uninstall third-party security software if you run it and disconnect all unnecessary peripherals.

• Visit the official Microsoft website and download Windows 10 installation media (Windows 11 version).
• Double-click the installer and select Yes when UAC shows up.
• Agree to terms.
• Select Upgrade this PC now and click Next.
• Windows will start downloading the needed files.
• Agree to the terms once again and click Next.
• Before installing, make sure that you are happy with your choices (otherwise, you can click Change what to keep option).
• Finally, click Install to begin the upgrade process.