Several users have claimed KB5017321 fails to install issue while installing this cumulative update for Windows 11 Version 22H2 because they get prompted with an error code 0x800f0806. If you are also looking for a troubleshooting guide to get past the situation, you can totally rely on this blog.

Before discussing its troubleshooting methods it’s quite imperative to identify the potential reasons that provoke the error. And after researching a lot about the error we concluded that corrupted system files are the primary reason for this error. But after going through a lot of reports we realized that there are several factors that are responsible for this annoying error. The factors are Corrupted Software Distribution Folder, Interference of Windows Defender, Disabled Windows Update Service and insufficient storage space, bad network connection.

How to Resolve KB5017321 fails to install in Windows 11

Method 1: Restart Windows Update Services

You are likely to face the above mention error if you have disabled Windows Update Services. So in order to gets past the situation we suggest you to restart Windows Update Services.

Here’s how:

Step 1: To launch the Run Windows press Win + R keys together> then type in services.msc and press Enter key

Step 2: Once the services app is opened, you need to find Windows Update Services and right-click on it

Step 3: Then click Properties and then change the Startup type from Manual to Automatic > Now click Apply and if the services is stopped, tap the Start button and tap on OK

Step 4: Once done then navigate to Settings and try to update Windows to the latest version.

Method 2: Run Windows Update Troubleshooter

In this method we suggest you to run the Windows Update Troubleshooter and to do the same follow the below mention instructions:

Step 1: First of all right-click Start Menu and tap on Settings> Under System, scroll down to the bottom and go to Troubleshoot> then click Other Troubleshooters

Step 2: Now under the other troubleshooters, tap the Run button on Windows Update

Once done then see if the issue resolved or not.

Method 3: Update Windows through Media Creation Tool

Several users have claimed that they managed to tackle the error just by updating their Windows by using Media Creation Tool. So you can also give a try to this method.

Here’s how:

Step 1: First of all download Media Creation Tool> then run the tool and wait for the application to collect a few things.

Step 2: Then Accept the Application Notices and License Terms> select Upgrade This PC Now and tap Next

Step 3: Now wait for the updates to download and install> lastly check the Windows Version by going to the System> About

Method 4: Clear Software Distribution Folder

Clearing the Software Distribution Folder is also one of the best methods to solve suck kinds of issues so to do follow the below mention guidelines:

Step 1: First of all press Windows keys and type Command Prompt> Right-click the Command Prompt and click Run as an Administrator

Step 2: Now stop the Windows Update Service to clear the software distribution folder by pasting the below mention commands in the terminal:

Step 3: Then launch Run Windows by pressing Win + R keys>Copy and Paste the following directory and click on OK


Step 4: After that select all the files by pressing Ctrl + A keys> And then press Delete button to clear the software distribution folder

Step 5: Finally Restart the Windows Update Services just by executing the below commands:

net start wuauserv

net start bits

Method 5: Install Manually with the Installation Assistant

If you are still struggling with KB5017321 fails to install in Windows 11 then you can try this method by following the below mention instructions:

Step 1: Navigate to Official Windows Page> then find he Download the Windows 11 Installation Assistant section.

Step 2: Then Run the tool as an Administrator by right-clicking the Windows Installation Assistant file

Step 3: Lastly Allow the application to run and wait for the result.

Method 6: Repair System Files

If none of the above mention methods works for you then repair system files. As we have earlier mentioned that you are likely to face the above mention error because of corrupted system files.

To do so follow the below mention guidelines:

Step 1: First of all click Start Menu & type Command Prompt> then right-click the terminal and click Run as an Administrator

Step 2: Copy and Paste the following commands and wait for the verification to be finished:

DISM /Online /Cleanup-Image /RestoreHealth

Dism /Online /Cleanup-Image /StartComponentCleanup

sfc / scannow

Lastly Restart the PC

Alternatively, you can also repair your system files by using an automatic PC Repair Tool. This is the best recommended tool because it will thoroughly repair your system files and not to mention it will also immune your machine form several malfunctioning of Windows.

⇑Get PC Repair Tool from Here⇓

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