Hello. I cannot seem to be able to install the latest KB5005565 update on Windows and I do not know any solutions to this problem. Have any ideas about what could be causing the error?
There are many operating systems, but one of the most popular ones is Windows created by Microsoft. It is widely preferred among home users and corporate environments. It has many customization functions and has built-in troubleshooters that fix different issues automatically. However, these troubleshooters do not always work and users are forced to look for solutions themselves.
Besides all its useful functions, Windows also has the ability to update itself automatically. Microsoft releases many security patches[ref en-1] and other updates frequently, so it is important to update the system to keep it working properly. Users can also update turn off automatic updates, and perform them themselves when they want to, but that does not always go well.
Issues with Windows updates is a common occurrence. Recently some users started experiencing troubles while trying to install the latest security update KB5005565 for Windows 10 version 21H1. Users experienced different errors including 0x800f0922, 0x8000ffff, 0x800f0826 and more. Some report that they downloaded the update successfully, but it got stuck while installing them. There are many reasons why this could be happening so it is not the easiest issue to take care of.
How to fix the latest windows security update kb5005565 not installing
Another possibility is that some of your system files are damaged. These kinds of issues are hard to point out, so we recommend using a powerful repair tool [d1] if you want to avoid going through all the possible fixes. This software can find the underlying problems on a PC, replace the damaged system components within just a few minutes, and fix BSODs,[ref en-2] registry issues, and errors. Besides, the app can be used as a maintenance utility for freeing up space,[ref en-3] and increase the performance of the machine.
If you have come across the "Updates failed" error, you need to fix it as soon as possible. Make sure to follow the guides step-by-step carefully:
Solution 1. Run the Windows Update Troubleshooter
One of the first things you should do, is use the built-in Windows Update Troubleshooter to see if it can take care of the problem for you:
Select Start and go to Settings
Choose Update & Security
Click Troubleshoot and Additional troubleshooter
Run the windows update troubleshooter
Select Windows Update and Run the troubleshooter
Restart
Solution 2. Create a system restore point
In the search box on the taskbar, type Create a restore point and select it from the list of results
On the System Protection tab in System Properties, select Create
Type a description for the restore point, then select Create and OK
Open the Command prompt as administrator on your computer
Create a system restore point
Type each command below and press Enter after each one: net stop wuauserv net stop bits net stop cryptsvc net stop trustedinstaller
You may need to run the command more than once until you see the message that the service has stopped successfully.
Solution 3. Clear the Windows Update cache
Open the Command prompt as administrator
Type the following commands and press Enter after each one: ren %systemroot%\\softwaredistribution softwaredistribution.bak ren %systemroot%\\system32\\catroot2 catroot2.bak
Clear the windows update cache
Solution 4. Restart Windows Update Service
Restarting Windows Update Service will undo any configurations done by the user or application:
Press Windows + R to open the Run dialog
Type services.msc and click OK
In the Services window, scroll down to find Windows Update Service
Restart windows update service
Right-click, select Properties, change its Startup type to Automatic, and change its Service status to Running
Click Apply and OK
Restart
Solution 5. Clean boot
Clean boot is one of the troubleshooting techniques that help identify if an app is causing the issue. It is usually performed when non-Microsoft products cause software conflicts. A clean boot helps in the easy start-up of OS by only loading essential files and programs:
Press Windows + R, type msconfig, and hit Enter
Go to Services tab and tick the Hide all Microsoft services checkbox
Select Disable all
Go to Startup tab and click Open Task Manager
Clean boot1
Here, right-click on each of the non-Windows entries and select Disable
Close down the Task Manager
Go to Boot tab and tick the Safe boot option
Clean boot2
Click Apply, OK, and restart your computer
Solution 6. Repair and Restore 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
Repair and restore system files
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
Solution 7. Use Media Creation Tool
Those who tried most of the solutions available online and nothing has worked said that they could fix the error after using Media Creation Tool's upgrade feature. Before you begin, make sure that all the external devices (printers, phones, cameras, etc.) are disconnected from your system. Also, backup your files just in case something goes wrong.
From the available options, select Upgrade this PC now and click Next
Use media creation tool
The necessary files should be then downloaded
Once the installation is complete, reboot your system
Bottom line
To resolve the installation issue with the KB5005565 update, you can start by running the Windows Update Troubleshooter and checking for damaged system files. If these steps do not resolve the problem, consider using a powerful repair tool to identify and fix underlying issues.
Frequently asked questions
Try running the Windows Update Troubleshooter by going to Settings > Update & Security > Troubleshoot. This can help identify and fix issues preventing the update from installing.
Ensure that your internet connection is stable and disable any third-party antivirus software temporarily, as it may interfere with the installation process.
You can download the standalone update package from the Microsoft Update Catalog website and install it manually to bypass the automatic update issues.
Windows error repairBSOD troubleshootingSystem file corruptionRegistry repairWindows Update failures
Olivia Morelli is a Windows systems expert specialising in diagnosing and repairing OS-level errors. She has spent nearly a decade writing guides that help everyday users recover from BSODs, corrupt system files, broken Windows installations, and failed update rollouts. Her methodical troubleshooting approach — starting with built-in tools before escalating to manual repairs — reflects years of practical experience supporting users across Windows 7, 8, 10 and 11. Olivia's guides are known for their clarity, completeness, and the care she takes to explain not just the fix but why the problem occurred.
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