How to fix
KB5003791 fails to install
on Windows

Hello. I tried installing the KB5003791 update for Windows 10 but it failed. Is there any way to resolve this?

Users who are anxious to benefit from the newest features and enhancements provided by the Windows 10, version 21H2 update may find the problem with KB5003791[ref en-1] failing to install in Windows 10 to be a frustrating one. This particular update is an enablement package that is intended to serve as a smooth "master switch" for upgrading from versions 2004, 20H2, or 21H1 to 21H2 with the least amount of disruption. This update's failure to install, however, might have a number of negative impacts on users.

Users are unable to use the new features and improvements added in Windows 10, version 21H2, which is the first immediate effect of the update failure. When users are hoping for enhancements to performance, security, or user interface, this can leave them feeling frustrated and disappointed.

Additionally, failing upgrades may result in system instability and security flaws. The most recent version has security issues that have been fixed, however, users who are unable to install essential updates like KB5003791 may still be at risk. Their computers may become exposed to malware, exploits, and other dangers as a result.

Furthermore, the overall user experience may be hampered by updates like KB5003791 that often fail. For both residential and corporate users, failed upgrades may result in error messages, system failures, or unusual behavior. Additionally, it might lead to a rise in the number of support requests sent to IT departments or customer support services, requiring more time and resources.

In this guide, you will find 7 steps that should help you fix KB5003791 failing to install in Windows 10. You can also run a maintenance tool like [d1] that can fix most system errors, BSODs,[ref en-2] corrupted files, and registry[ref en-3] issues. Otherwise, follow the step-by-step instructions provided below.

Method 1. Run the Windows Update Troubleshooter

• Press the Windows + X keys and go to Settings.
• Go to Update and Security.
• Click Troubleshooter.
• Select Additional troubleshooters.

• Run the Update troubleshooter.
• Restart.

Method 2. Fix Corrupted System Files

Use Command Prompt commands to repair system file corruption:

• Open Command Prompt as administrator
• Use the following command and press Enter:
  sfc /scannow

• Reboot your system
• If SFC returned an error, then use the following command lines, pressing Enter after each:
  DISM /Online /Cleanup-Image /CheckHealth
  DISM /Online /Cleanup-Image /ScanHealth
  DISM /Online /Cleanup-Image /RestoreHealth

Method 3. Restart Windows Services

• Type services in the search bar and launch the Services utility.
• Find Windows Update in the list.
• Double-click on it, set the Startup type to Automatic, and click Apply.
• Now click on Restart the Service.

• Do the same with Background Intelligent Transfer Service.

Method 4. Remove Windows Update Files

• Press the Windows key + X and click on PowerShell (Admin).
• Copy and paste the following commands and press Enter after each one:
  net stop bits
  net stop wuauserv
  net stop msiserver
  net stop cryptsvc

• Press the Windows key + R to open the Run box.
• Type %windir%\softwaredistribution\ press Enter.
• Delete all content inside the SoftwareDistribution folder.
• Press the Windows key + X and click PowerShell (Admin) again.
• Copy and paste the commands below and press Enter after each one:
  net start bits
  net start wuauserv
  net start msiserver
  net start cryptsvc
• Check if you can install Windows updates

Method 5. Update Drivers

• In the search box on the taskbar, enter device manager, then select Device Manager.
• Select a category to see the names of devices, then right-click the one you’d like to update.
• Select Search automatically for updated driver software.
• Select Update Driver.

• If Windows doesn't find a new driver, you can try using an automatic tool like [rev id="DriverFix"] which can find the best drivers for your system.

Method 6. Try Clean Boot

• Open the Search menu, type in system configuration, and press Enter.
• Under the Services tab, tick the Hide all Microsoft services box.
• Click on Disable all button.

• Head over to the Startup tab and click on Open Task Manager.
• Select a third-party program and click on Disable at the top.
• Repeat this step to disable all third-party apps and programs.
• Restart your PC to enter the clean boot state and see if the issue persists.
• If the issue disappeared in the clean boot state, then you can be certain that a third-party app is causing it.
• Go through all recently installed apps or programs and remove them one by one.

Method 7. Use Media Creation Tool

• Visit the official Microsoft website and download Windows 10 installation media.
• Double-click the installer and select Yes when UAC shows up.

• Agree to terms and click Next.
• Select Upgrade this PC now and select Next.
• Proceed with on-screen instructions.
• Your PC will restart.