How to Fix Windows Update Error 0x800f0845 in 9 Proven Ways

What Is Windows Update Error 0x800f0845?

Windows update error 0x800f0845 means Windows failed to complete an update installation. It does not point to one specific cause. Instead, the error can appear when something prevents Windows from downloading, verifying, or applying an update correctly.

For example, a specific KB update may fail repeatedly, the installation may stop at a certain percentage, or Windows may roll back the update after a restart.

Because several problems can trigger the same error, start with the simpler fixes below and move to advanced repairs only when needed.

How to Fix Windows Update Error 0x800f0845?

If Windows Update failed with error code 0x800f0845, try the following fixes in order.

Fix 1. Run the Windows Update Troubleshooter

Start with the built-in Windows Update troubleshooter. It can detect common problems with update components and apply available fixes automatically.

• Press Windows + I to open Settings. Go to "System > Troubleshoot > Other troubleshooters".

• Find "Windows Update" and click "Run".

  

• Follow the instructions on the screen. Restart your PC when finished, then check for updates again.

For Windows 10: Go to "Settings > Update & Security > Troubleshoot > Additional troubleshooters > Windows Update", then run the troubleshooter.

Fix 2. Pause and Resume Windows Updates

A temporary Windows Update problem can sometimes interrupt an installation. Pausing and resuming updates gives Windows another chance to start the update process normally.

• Open "Settings > Windows Update".

• Use "Pause updates" to temporarily stop new updates.

  

• Resume updates, then click "Check for updates" and try the failed update again.

For Windows 10: Open "Settings > Update & Security > Windows Update" to access the pause and resume options.

Fix 3. Restart Windows Update Services

Windows relies on several background services to download and install updates. If one of these services has stopped or become stuck, restarting it may help clear error 0x800f0845.

• Press Windows + R, type "services.msc", and press Enter.

  

• Find "Windows Update". Right-click it and select "Restart". If it is stopped, select "Start".

  

• Check "Background Intelligent Transfer Service (BITS)" and "Cryptographic Services" in the same way.

• Close the Services window and try Windows Update again.

Fix 4. Repair System Files with DISM and SFC

Corrupted Windows components or system files can prevent updates from installing. Microsoft recommends using DISM to repair the Windows image and then SFC to check protected system files.

• Search for "Command Prompt", right-click it, and select "Run as administrator".

• Run:

  DISM.exe /Online /Cleanup-image /Restorehealth

• Wait for DISM to finish. Then run:

  sfc /scannow

  

• Wait until the scan reaches 100%, restart your computer, and try Windows Update again.

Fix 5. Reset Windows Update Components

If Windows Update continues to fail, its cached files or update components may need to be rebuilt. This method stops the related services, refreshes the update folders, and starts the services again.

• Open "Command Prompt as administrator".

• Stop the update-related services by running these commands one at a time:

  net stop wuauserv

  net stop cryptSvc

  net stop bits

  net stop msiserver

• Rename the SoftwareDistribution and Catroot2 folders:

  ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
  ren C:\Windows\System32\catroot2 Catroot2.old

• Restart the services:

  net start wuauserv

  net start cryptSvc

  net start bits

  net start msiserver

• Restart the PC and check for updates again.

Windows will create fresh versions of the renamed update folders when needed. This can help when damaged cached update data is causing repeated installation failures.

Fix 6. Install the Failed Update Manually

When error code 0x800f0845 affects only one KB update, try downloading that update manually instead of repeatedly installing it through Windows Update.

• Open "Settings > Windows Update > Update history" and identify the failed update. Note its KB number, such as "KBxxxxxxx".

• Go to "Settings > System > About" and check your Windows version and system type.

• Open the Microsoft Update Catalog and search for the KB number.

  

• Find the package that matches your Windows version and system architecture, such as x64 or ARM64.

• Download and install the package, then restart your PC if required.

Make sure the KB number, Windows version, and architecture all match your system before installing the package.

Fix 7. Check for Third-Party Software Conflicts

Security software and other background programs can sometimes interfere with Windows Update. Possible conflicts include third-party antivirus tools, anti-cheat software, and some system optimization utilities.

• Close unnecessary third-party programs running in the background.

• If you use third-party antivirus or security software, temporarily disable it and try the update again. Re-enable the protection afterward.

• If you still cannot identify the conflicting program, perform a clean boot to start Windows with only essential services and startup programs.

• Try Windows Update again. If it works, restore your normal startup configuration and identify the conflicting program.

Fix 8. Reinstall Windows 11 Through Windows Update

If the previous methods do not work, Windows 11 includes a recovery option that can repair problems related to Windows Update. It reinstalls the same version of Windows while preserving your apps, personal files, and settings.

• Open "Settings > System > Recovery".

• Find "Fix problems using Windows Update" and click "Reinstall now".

  

• Follow the prompts to download and reinstall Windows. Keep your PC connected to power and the internet.

• Restart the computer when the process finishes, then check for updates again.

According to Microsoft's Windows Update recovery guide, this feature reinstalls the current version of Windows to repair system files and components while preserving apps, files, and settings.

Fix 9. Perform an In-Place Repair Upgrade

An in-place repair upgrade is a deeper option when Windows Update still fails after repairing update components and system files. It reinstalls Windows while allowing you to keep your personal files, apps, and settings.

• Download the appropriate Windows installation media or ISO from Microsoft.

• While signed in to Windows, open the installation media in File Explorer and run "setup.exe".

• Continue through Windows Setup and select "Change what to keep".

• Choose "Keep personal files and apps".

  

• Start the installation and wait for Windows to reinstall. Your PC may restart several times.

An in-place repair upgrade is different from a clean installation. Choosing "Keep personal files and apps" preserves your data and installed apps, while a clean installation can remove them.

Lost Files After Fixing Windows Update Error 0x800f0845?

If files are missing after an update, first check the Recycle Bin, OneDrive, and available backups. If you still cannot find them, 4DDiG Data Recovery can help scan HDDs, SSDs, USB drives, memory cards, and other storage devices for your lost files.

• Launch 4DDiG and select the drive where your files were stored before fixing Windows Update error 0x800f0845.

  

• While 4DDiG scans the drive, use the file type, and search filters to locate the missing data.

  

• When the scan is complete, select and preview the files you want to restore. Check their names, contents, and dates to confirm that they are the files missing after the Windows update, then click "Recover".

  

• Save the recovered files to a different drive or an external storage device. Do not save them back to the affected drive, as doing so could overwrite other files that have not yet been recovered.

  

FAQs About Windows Update Error 0x800f0845

What does Windows Update error 0x800f0845 mean?

Error 0x800f0845 means Windows was unable to successfully install or apply an update. Possible causes include corrupted system files, damaged update components, service problems, or third-party software conflicts.

Can I manually install an update that fails with 0x800f0845?

Yes. Find the failed update's KB number in Windows Update history, search for it in the Microsoft Update Catalog, and download the package that matches your Windows version and system architecture.

Will fixing error 0x800f0845 delete my files?

Most troubleshooting methods, including the Windows Update troubleshooter, DISM, SFC, and resetting update components, do not delete personal files. However, some reset or reinstall options can remove data, so check what will be kept before starting a Windows recovery or reinstallation.

Does error 0x800f0845 affect both Windows 11 and Windows 10?

Yes. Error 0x800f0845 can occur when installing updates on both Windows 11 and Windows 10. The troubleshooting process is similar, although some Settings paths and recovery features differ between the two systems.

Conclusion

Windows Update error 0x800f0845 can often be resolved by following the above methods. If the problem continues, Windows 11's repair reinstall option or an in-place repair upgrade can address deeper Windows problems.

If files go missing while dealing with a failed update, check your backups first. When no usable backup is available, 4DDiG can scan the affected drive and help recover files that are still recoverable.