How to fix
Windows update error 0x800f0835
on Windows

I've been having problems with installing some Windows updates lately. The process seems to start and then at some point simply ends abruptly with an error code 0x800f0835. Could you help me?

Error code 0x800f0835 usually occurs when an update fails to install on your system due to some missing files or system-level issues. This error mostly occurs with cumulative updates or feature updates in Windows, which stops the process and keeps your system without the latest security patches or features. The error code is usually accompanied by a failure message in the Windows Update interface or the Event Viewer logs.

Missing or damaged update package issues are the most frequent reason for error 0x800f0835. That can be when the update is incompletely or improperly downloaded. In that process, poor and unstable internet access can play havoc. Additionally, the disturbances on the side of third-party antivirus programs or system settings may make Windows Update incapable of accessing and putting in place all the required files properly.

The other probable cause is corruption or damage within the Windows Update components. Some of these are very important parts, such as the SoftwareDistribution folder and the Background Intelligent Transfer Service or BITS, which plays a major role in update management. If something goes wrong and these components get corrupted or misconfigured, the system may encounter an error 0x800f0835 while applying an update.

It also occurs because of conflicts with system files or other already installed updates. If any prior update has been incomplete or residual files of updates were left over, then further updates will surely get conflicted. Some updates have dependencies which, if not present in the system by default, then it results in failure with 0x800f0835.

Often, resolving this error involves solving underlying system conflicts, repairing corrupted files, or resetting update components to proper functionality. For continuing issues, accessing the [d1] PC repair tool may be effective in finding and repairing underlying issues preventing updates from completing installation.

Fix 1. Run Disk Cleanup

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

Fix 2. Check for corrupted files

• Type in cmd in Windows search.
• Right-click on Command Prompt and select Run as administrator.
• In the User Account Control window, click Yes.
• In the Command Prompt window, paste the following command and hit Enter:
  sfc /scannow
• Next, use the following commands, pressing Enter each time:
  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).
• Reboot your computer.

Fix 3. Run Windows update troubleshooter

• Type in Troubleshoot in Windows search and hit Enter.
• Go to Additional Troubleshooters/Other troubleshooters.
• Select Windows update and click Run the troubleshooter/Run.
• Wait till the scan is finished, and then apply the recommendations.
• Restart your system.

Fix 4. Check relevant services

• Type in Services in Windows search and hit Enter.
• Locate Windows Update service.
• If this service is already running, right-click and select Restart.
• If it is not running, double-click it, select Automatic under the Startup type from the drop-down menu.
• Click Start, Apply, and OK.
• Repeat the process with the Background Intelligent Transfer Service (BITS), Cryptographic, and Windows Installer services.

Fix 5. Reset Windows update components

• Open Command Prompt as administrator.
• Paste in each of these commands, pressing Enter every time:
  net stop bits
  net stop wuauserv
  net stop appidsvc
  net stop cryptsvc
  Del “%ALLUSERSPROFILE%\Application Data\Microsoft\Network\Downloader\*.*”
  rmdir %systemroot%\SoftwareDistribution /S /Q
  rmdir %systemroot%\system32\catroot2 /S /Q
  regsvr32.exe /s atl.dll
  regsvr32.exe /s urlmon.dll
  regsvr32.exe /s mshtml.dll
  netsh winsock reset
  netsh winsock reset proxy
  net start bits
  net start wuauserv
  net start appidsvc
  net start cryptsvc 
• Reboot your system.

Fix 6. Run Clean Boot

• Type msconfig in the Windows search box and press Enter.
• Pick the Services tab.
• Mark Hide all Microsoft services and select Disable all.
• Select the Startup tab and click Open Task Manager.
• In the Task Manager, right-click on each of the items and select Disable, then close the Task Manager.
• Go to the Boot tab, mark the Safe Boot option, then click Apply and OK.
• On the System Configuration window, click OK.
• Restart your computer.
• Try updating Windows again.

Fix 7. Install the update manually

• Type in Updates in Windows search and press Enter.
• Select View update history.
• Find the update that failed with the 0x800f0835 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.
• Follow the on-screen instructions to finish the installation process and restart your computer.