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How to Fix Windows 10 KB4561645 Update Errors and Installation Issues

Windows 10 updates are essential for keeping your system secure and running smoothly. However, sometimes specific updates like KB4561645 can cause errors or fail to install properly. This can be frustrating and disrupt your workflow.

In this article, we will walk you through simple and effective ways to fix common issues related to the KB4561645 update. Each step is explained in detail, making it easy even for beginners to follow.

By the end, you should be able to resolve the update error and get your Windows 10 system up to date. Let’s get started with some quick checks before diving into troubleshooting.

Remember, patience is key when dealing with update problems, as some solutions may take time to complete.

Quick Note: Prerequisites and Initial Checks

Before you start troubleshooting, make sure of the following:

  • Stable Internet Connection: Windows updates need a reliable connection to download necessary files.
  • Enough Disk Space: Ensure you have at least 20% free space on your system drive (usually C:). Updates require temporary storage to install.
  • System Restart: Sometimes, simply restarting your computer can fix minor glitches affecting updates.
  • Disable Antivirus Temporarily: Third-party antivirus programs can interfere with update installations. Temporarily disabling them may help.

Step 1: Run the Windows Update Troubleshooter

The easiest and safest way to fix update errors is by using the built-in Windows Update Troubleshooter. This tool automatically scans and repairs common update problems.

  1. Click the Start button and select Settings (gear icon).
  2. Go to Update & Security.
  3. Click Troubleshoot on the left sidebar.
  4. Select Additional troubleshooters.
  5. Click on Windows Update and then click Run the troubleshooter.
  6. Follow the on-screen instructions and wait for the process to complete.

After the troubleshooter finishes, it may fix the issue automatically or provide suggestions. Restart your computer and try installing KB4561645 again.

Step 2: Clear the Windows Update Cache

Corrupted or stuck update files can prevent installation. Clearing the update cache forces Windows to download fresh files.

Here’s how to do it:

  1. Press Windows Key + R to open the Run dialog box.
  2. Type services.msc and press Enter.
  3. In the list, find Windows Update, right-click it, and select Stop.
  4. Open File Explorer and navigate to C:WindowsSoftwareDistributionDownload.
  5. Delete all files and folders inside the Download folder.
  6. Go back to the Services window, right-click Windows Update again, and select Start.

Now, try running Windows Update again to see if the KB4561645 installs successfully.

Step 3: Use the System File Checker (SFC) Tool

Sometimes, corrupted system files can block updates. The System File Checker scans and repairs these files.

Follow these instructions carefully:

  1. Type cmd in the Windows search bar.
  2. Right-click Command Prompt and select Run as administrator.
  3. In the black command window, type the following command and press Enter:
sfc /scannow

This process may take several minutes. Do not close the window until it finishes. If corrupted files are found, Windows will fix them automatically.

Once done, restart your PC and try updating again.

Step 4: Reset Windows Update Components Manually

If the problem persists, resetting Windows Update components can help fix deeper issues. This method clears and rebuilds update-related files and services.

Here’s the step-by-step process:

  1. Open Command Prompt as administrator (see Step 3).
  2. Type these commands one by one, pressing Enter after each:
net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
ren C:WindowsSoftwareDistribution SoftwareDistribution.old
ren C:WindowsSystem32catroot2 catroot2.old
net start wuauserv
net start cryptSvc
net start bits
net start msiserver

These commands stop update services, rename folders that store update data (forcing Windows to recreate them), and then restart the services.

After completing these commands, restart your computer and check for updates again.

Step 5: Download and Install the Update Manually

If Windows Update still fails, you can manually download the KB4561645 update package and install it yourself.

  1. Visit the Microsoft Update Catalog.
  2. Search for “KB4561645”.
  3. Find the version matching your Windows 10 system architecture (32-bit or 64-bit).
  4. Click Download and save the file.
  5. Once downloaded, double-click the file and follow the installation wizard.

After installation, reboot your system to apply changes.

Alternative Methods and Advanced Options

If the above steps don’t work, consider these options:

  • Perform a Clean Boot: This starts Windows with minimal drivers and startup programs to avoid software conflicts during updates.
  • Use System Restore: If the update errors started recently, restoring your PC to a previous state may help.
  • Update Drivers: Outdated hardware drivers can cause update problems. Use Device Manager to check for updates.
  • Use Media Creation Tool: Download the Windows 10 Media Creation Tool from Microsoft to upgrade your PC manually.

Frequently Asked Questions (FAQs)

Why does the KB4561645 update fail to install?

There can be multiple reasons such as corrupted update files, insufficient disk space, software conflicts, or corrupted system files.

Is it safe to disable antivirus during update?

Yes, temporarily disabling third-party antivirus software can prevent interference with the update process. Just remember to enable it again afterward.

Can I uninstall the KB4561645 update if it causes problems?

Yes, you can uninstall updates via Settings > Update & Security > View update history > Uninstall updates. However, uninstalling security updates is not recommended unless necessary.

How long should the Windows Update Troubleshooter take?

It usually takes a few minutes but can vary depending on your system’s performance and issues found.

Will resetting Windows Update components delete my files?

No, resetting update components only affects update-related files and services. Your personal data remains safe.

When Nothing Works

If none of these solutions resolve the KB4561645 update errors, consider the following final options:

  • Contact Microsoft Support: Use the official Microsoft Support for personalized help.
  • Perform a Repair Install: This reinstalls Windows without affecting your files or apps and can fix deep system issues.
  • Backup and Clean Install: As a last resort, back up your important files and perform a fresh installation of Windows 10.

Conclusion

Dealing with Windows 10 update errors like those from KB4561645 can be challenging, but following these detailed steps will guide you through the most common fixes. Starting with simple tools like the troubleshooter and progressing to manual resets ensures you address the issue methodically.

Always remember to create backups before making major system changes and keep your system drivers up to date. With patience and these techniques, you can maintain a healthy, up-to-date Windows 10 system.

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