How to fix Windows update error 0xc8000643?

Error 0xc8000643 tends to pop up during the update process, stopping it cold and leaving users puzzled. It’s not an isolated issue – others have faced this hurdle too, making it a shared frustration when Windows Update hits a snag. Designed to keep your PC secure and up to date with Microsoft’s latest fixes, Windows Update usually runs quietly in the background – until this error 0xc8000643 shows up unexpectedly.

Error 0xc8000643 often hints at trouble between Windows and its update servers, possibly from corrupted cache files or a service that’s gone off course. An unstable network, or incorrect network settings, might also be the culprit. Sometimes, third-party security tools interfere too much, or a deeper system fault could be quietly stirring the problem. Identifying the cause is key to moving forward.

Solutions are available to tackle error 0xc8000643 and get your updates back on track. You might try restarting the update services to reset the system’s alignment or clear out cached data to sweep away any roadblocks. Resetting Windows update components – which would clear the Software Distribution folder – could resolve it, and downloading the update manually from Microsoft’s site is another option.

If the problem ties back to more complex system issues, a repair and maintenance tool like FortectMac Washing Machine X9 could step in to fix underlying Windows glitches, smoothing the path for successful updates.

Fix 1. Run Windows update and network troubleshooters

To check the basics like common update errors and network issues, you should start by running appropriate troubleshooters.

• Type troubleshoot in Windows search and press Enter.
• In this window, select the Additional troubleshooters or Other troubleshooters option (depending on the Windows version).
• Find Windows update section and click Run or Run the troubleshooter.
• Wait till troubleshooter finishes its task and then implement all the recommendations.
• Repeat this with Network troubleshooter in Windows 11.

To run Network troubleshooter in Windows 10, follow these steps:

• Right-click on Start and select Settings.
• Go to the Network & Internet section.
• On the right side, locate the Advanced network settings section.
• Click Network troubleshooter.
• Wait till the troubleshooter finishes the scan.
• Apply the changes.

Fix 2. Check relevant services

For Windows update to succeed, you need to make sure that services connected to the process are running. Thus, restarting them and setting them to run automatically is one of the ways you can fix the 0xc8000643 error.

• Type Services in Windows search and hit Enter.
• Scroll down to the very bottom and find Windows Update service.
• Right-click on the service and pick Restart.
• If the service is not running, double-click it to open Properties.
• Under Startup type, select Automatic from the drop-down menu.
• Click Start if the service was not running.
• Finally, click Apply and OK.
• Repeat this with Background Intelligent Transfer Service (BITS) and Cryptographic services.

Fix 3. Perform Clean Boot

Clean Boot could help you determine whether conflicts with third-party security software are causing update issues.

• Type Msconfig in Windows search and press Enter.
• At the top, pick Services tab.
• Mark the Hide all Microsoft services checkbox and click Disable all.
• Next, go to the Startup tab and click Open Task Manager.
• In the Task Manager, select each of the items and click Disable.
• Close Task Manager and go to the Boot tab in System configuration window.
• Here, mark Safe boot, click Apply and OK.
• Restart your computer and try updating again.

Fix 4. Reset Windows update components

• Type cmd in Windows search.
• Right-click on Command Prompt and select Run as administrator.
• The User Account Control (UAC) window will ask whether you want to allow changes to your computer – click Yes.
• 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:WindowsSoftwareDistribution SoftwareDistribution.old
  ren C:WindowsSystem32catroot2 Catroot2.old
  Note: If your Windows installation is not on the C drive, replace “C” with the appropriate drive letter.
• Restart the Windows Update-related services by running the following commands:
  net start wuauserv
  net start cryptSvc
  net start bits
  net start msiserver
• Restart your computer.

Fix 5. Try installing manually

If automatic installation of Windows updates fails, you can always try to do it manually, as explained below.

• 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 0xc8000643.
• 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. Use Media Creation Tool

You can always employ Media Creation Tool to install the latest version of Windows. Before proceeding, make sure you disconnect unnecessary peripherals, such as printers, and uninstall your third-party security software.

• 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 select Next.
• Windows will now download all the necessary files – it might take a while.
• Agree to the terms once again and click Next.
• Before installing, ensure you are happy with your choices (otherwise, you can click the Change what to keep option).
• Click Install to begin the upgrade process.

The above is the detailed content of How to fix Windows update error 0xc8000643?. For more information, please follow other related articles on the PHP Chinese website!