KB5065426 Update Shows Install error – 0x800f081f [Solved]

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Recently, I talked about issues with the KB5065426 update, but later I discovered that many were getting the 0x800f081f install error while downloading the update. I checked on another PC, and it was indeed there.

So, I sat down to troubleshoot it and got the 0x800f081f install error on Windows fixed within minutes. Here’s what worked for me, and the solutions that helped others!

How can I fix the 0x800f081f install error with KB5065426 Windows update?

1. Fix problems using Windows Update

When it comes to fixing issues in Windows, I rely on the built-in tools. And ever since Microsoft removed the troubleshooters, I have been using another trick, fixing issues via Windows’ “Recovery Settings“.

Don’t worry, this is not going to affect your personal files, installed apps, or configured settings. It just fixes corrupted Windows files.

Steps:

1. Press Windows + I to open Settings, go to System, then select Recovery on the right.
2. Now, click the Reinstall Now button next to Fix problems using Windows Update.
3. Click Yes in the confirmation prompt to proceed.
4. Wait until your PC downloads and installs a Windows repair version to fix the system files. It may take up to an hour.
5. 
6. Then restart it, and check whether the 0x800f081f install error with the KB5065426 update is fixed.

2. Reset the Windows update components

For Windows update errors like 0x800f081f with KB5065426, a quick fix is to reset the Windows update components. It’s simple and effective; you just have to run a series of commands.

1. Press Windows + R to open Search, type Command Prompt, and click on Run as administrator.
2. Click Yes in the UAC prompt.
3. Paste the following commands and hit Enter after each to stop services related to Windows updates:
   net stop bits

net stop wuauserv

net stop appidsvc

net stop cryptsvc
4. Now, run this command:
   Del "%ALLUSERSPROFILE%\Application Data\Microsoft\Network\Downloader*.*"
5. Next, run these two:
   rmdir %systemroot%\SoftwareDistribution /S /Q

rmdir %systemroot%\system32\catroot2 /S /Q
6. Run these commands to reset the BITS and Windows Update service:
   sc.exe sdset bits D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWLOCRRC;;;AU)(A;;CCLCSWRPWPDTLOCRRC;;;PU)


sc.exe sdset wuauserv D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWLOCRRC;;;AU)(A;;CCLCSWRPWPDTLOCRRC;;;PU)
7. Run this command next to change the directory and enter the System32 folder:
   cd /d %windir%\system32
8. Execute these commands individually (paste one and hit Enter after it) to re-register the DLL files critical to Windows update:
   regsvr32.exe /s atl.dll

regsvr32.exe /s urlmon.dll

regsvr32.exe /s mshtml.dll

regsvr32.exe /s shdocvw.dll

regsvr32.exe /s browseui.dll

regsvr32.exe /s jscript.dll

regsvr32.exe /s vbscript.dll

regsvr32.exe /s scrrun.dll

regsvr32.exe /s msxml.dll

regsvr32.exe /s msxml3.dll

regsvr32.exe /s msxml6.dll

regsvr32.exe /s actxprxy.dll

regsvr32.exe /s softpub.dll

regsvr32.exe /s wintrust.dll

regsvr32.exe /s dssenh.dll

regsvr32.exe /s rsaenh.dll

regsvr32.exe /s gpkcsp.dll

regsvr32.exe /s sccbase.dll

regsvr32.exe /s slbcsp.dll

regsvr32.exe /s cryptdlg.dll

regsvr32.exe /s oleaut32.dll

regsvr32.exe /s ole32.dll

regsvr32.exe /s shell32.dll

regsvr32.exe /s initpki.dll

regsvr32.exe /s wuapi.dll

regsvr32.exe /s wuaueng.dll

regsvr32.exe /s wuaueng1.dll

regsvr32.exe /s wucltui.dll

regsvr32.exe /s wups.dll

regsvr32.exe /s wups2.dll

regsvr32.exe /s wuweb.dll

regsvr32.exe /s qmgr.dll

regsvr32.exe /s qmgrprxy.dll

regsvr32.exe /s wucltux.dll

regsvr32.exe /s muweb.dll

regsvr32.exe /s wuwebv.dll
9. Now, execute these two commands to reset the network setup:
   
   netsh winsock reset proxy

netsh winsock reset
10. Finally, run these commands to restart the services you stopped earlier:
    
    net start bits

net start wuauserv

net start appidsvc

net start cryptsvc
    
    
11. Once done, restart the computer and check for improvements.

3. Repair the corrupted system files

If the first two didn’t work, you should repair the corrupted system files using the DISM (Deployment Image Servicing and Management) tool and the SFC (System File Checker) scan. This will also fix other trivial issues with the PC, if the system files are indeed corrupted.

Steps:

1. Press Windows + S to open Search, type Command Prompt, and click on Run as administrator.
2. Click Yes in the UAC prompt.
3. Paste the following commands and hit Enter after each:
   
   DISM /Online /Cleanup-Image /CheckHealth

DISM /Online /Cleanup-Image /ScanHealth

DISM /Online /Cleanup-Image /RestoreHealth
   
   
4. Now, run this command:
   
   sfc /scannow
   
   
5. Once done, restart the PC to apply the changes and check for improvements.

This also helped many with the 0x80073712 Windows update error.

4. Perform an in-place upgrade

Lastly, you can perform an in-place upgrade on Windows. It’s akin to reinstalling the OS, but is much simpler and doesn’t result in data loss. All you have to do is download the Windows 11 ISO from Microsoft’s official website and then use the setup for a repair upgrade.

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That’s it! For me, the first solution fixed the 0x800f081f install error with Windows update KB5065426. So far, I haven’t been able to find the underlying cause, but it was most likely the system files.

Try out all the solutions and let me know which one worked for you in the comments section.