How to fix
Windows update error 0x80240042
on Windows

Hi, I keep getting a 0x80240042 error when trying to install the latest Windows updates. Could you advise on what to do?

Encountering the Windows Update error 0x80240042 can be a frustrating roadblock for users attempting to keep their systems secure and up-to-date with the latest features and fixes. This specific error code often emerges during the update process, halting installations and leaving systems vulnerable to both security risks and missing out on important Windows enhancements. 

Resolving Windows Update error 0x80240042 requires a systematic approach, given its indication of issues in the update downloading or installation process, often due to file corruption, conflicts, or insufficient system resources. This concise guide aims to provide clear directions for troubleshooting and fixing this error, facilitating a smooth update process for Windows users.

The error 0x80240042 generally suggests problems with the update mechanism, such as corrupted update files or operational issues with the Windows Update service, hindering the installation of crucial updates. A practical first step in addressing this error is utilizing the Windows Update Troubleshooter, a built-in utility designed to identify and resolve common disruptions automatically.

If the troubleshooter does not rectify the problem, manually resetting the Windows Update components might be necessary. This involves clearing the update cache and restarting the update service to eliminate potential glitches or corrupt files interfering with the update process.

Additionally, the integrity of system files plays a critical role in update installation. Running tools like System File Checker (SFC) and Deployment Image Servicing and Management (DISM) can repair or replace damaged files, ensuring a stable foundation for updates.

Another essential factor to consider is the availability of sufficient storage space on the system drive. Updates require a specific amount of free space to download and install properly; insufficient space can lead to errors. Cleaning temporary files and managing storage effectively can mitigate these issues.

Should these steps fail to resolve the 0x80240042 error, you could try scanning your PC with a repair tool such as [d1], which could find underlying Windows issues and fix them automatically for you.

Fix 1. Run the Windows Update Troubleshooter

The Windows Update Troubleshooter is designed to automatically find and fix problems with Windows Update. It works by scanning your system for issues related to Windows Update and attempting to resolve them automatically, which can fix error 0x80240042 without requiring detailed technical knowledge.

• Type Troubleshoot in Windows search and press Enter.
• Select Additional troubleshooters/Other troubleshooters.
• Find Windows Update from the list.
• Click it and select Run the troubleshooter/Run.
• Restart your device when the update process finishes.

Fix 2. Ensure a stable internet connection

A stable internet connection is crucial for downloading and installing Windows updates. An unstable or slow connection can interrupt the update process, leading to errors like 0x80240042. Ensuring your internet connection is stable can help avoid these issues.

• Restart your router and modem by unplugging them for one minute and plugging them back in.
• Connect your computer to the router using an Ethernet cable instead of using Wi-Fi to ensure a more stable connection.
• Temporarily disable any VPN or proxy services to check if they might be causing the issue.
• Also temporarily disable antivirus software that might be blocking Windows updates.

Fix 3. Check  relevant services

Windows Update requires specific services to function properly. Restarting them or setting them to run automatically can fix problems that prevent updates from being installed.

• Type in Services in Windows search and press Enter.
• Find Background Intelligent Transfer Service (BITS).
• 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.
• Repeat this process for Windows Update and Cryptographic services.

Fix 4. Reset Windows Update components

Resetting Windows Update components manually can resolve persistent update issues by restoring Windows Update settings to their default state. This fix addresses problems caused by corrupt update files or configurations.

• Type cmd in Windows search.
• Right-click on Command Prompt and select Run as administrator.
• When the User Account Control window pops up, click Yes.
• Type the following commands one by one in Command Prompt and press Enter after each:
  net stop wuauserv
  net stop cryptSvc
  net stop bits
  net stop msiserver
  Ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
  Ren C:\Windows\System32\catroot2 Catroot2.old
• When these commands are executed, the last thing to do is to re-enable relevant services:
  net start wuauserv
  net start cryptSvc
  net start bits
  net start msiserver
• Reboot your device.

Fix 5. Check for corrupted files

Built-in utilities in Windows allow users to scan for and restore corruptions in system files. Running these scans can fix broken system files that might be causing the update error.

• Open Command Prompt as administrator.
• 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
  
• (Note: if you get an error executing this last command, add /Source:C:\RepairSource\Windows /LimitAccess to it and try again).
• Restart your system.

Fix 6. Install updates manually

If the automatic update fails, manually downloading and installing the update may work.

• Type in Updates in Windows search and press Enter.
• Select View update history.
• Find the update that failed with the 0x80240042 error and copy its KB number.
• Open your browser and go to Microsoft Update Catalog.
• Within the search bar, type in the KB number and click Search.
• Find the correct version of the update for your operating system (to check this, right-click on Start and pick System. Under Device specifications and check the System type) and click Download.
• Use on-screen guidelines to finish the installation process and restart your computer.

Fix 7. Free up disk space

Insufficient disk space can prevent Windows updates from downloading and installing. 

• Type Disk Cleanup in Windows search and hit Enter.
• If your Windows is installed on drive C, pick it from the list (it should be by default) and press OK.
• Click Clean up system files.
• Select your main disk 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.
• Click OK - the process should be finished shortly.

Fix 8. Use Media Creation Tool

Media Creation Tool can help you repair Windows installation without losing personal files.

• Visit the official Microsoft website and download Windows 10 installation media (Windows 11 version).
• Double-click the installer, select Yes when UAC shows up, and agree to the terms.
• Launch the installer.
• Agree to the terms and click Next.
• Select Upgrade this PC now and click Next.
• Windows will start downloading the needed files.
• Agree to 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.