How to Fix Windows 11 Update Error KB5073455 and Diagnose Repeated Installation Failures

Start with a reset of Windows Update components, then repair system files with DISM and SFC before trying KB5073455 again. Repeated install failures usually come from damaged update cache files, missing servicing components, driver conflicts, low free space, or a security tool interrupting the install. Microsoft’s repair guidance commonly uses DISM and System File Checker to fix the Windows image before retrying updates [source: Microsoft].

Why KB5073455 Keeps Failing

Windows Update errors are annoying because the message is often vague. You may see “Install error”, “Something went wrong”, or a code such as 0x800f081f, 0x80073712, 0x80070002, 0x800f0922, or 0x80248007. Honestly, it feels like Windows could save everyone twenty minutes by saying which file broke.

KB5073455 may fail for several reasons:

• Corrupt SoftwareDistribution cache: Windows downloaded a bad or partial package.
• Component store damage: System files needed for servicing are missing or broken.
• Low disk space: Feature and cumulative updates need room for staging and rollback files.
• Pending restart: An older update is waiting to finish.
• Driver conflict: Storage, graphics, audio, or chipset drivers can block setup.
• VPN or antivirus conflict: Security tools can interfere with download or verification.

Step 1: Restart, Then Check the Basics

Do not skip the simple checks. They fix more update failures than people want to admit.

1. Restart the PC twice. Yes, twice. A pending operation may finish on the second reboot.
2. Check free space. Keep at least 20 GB free on the system drive.
3. Unplug nonessential USB devices, docks, capture cards, and external drives.
4. Pause your VPN and third-party antivirus for the update attempt.
5. Open Settings > Windows Update and click Retry.

If the update fails again, write down the exact error code. That code will guide the next step.

Step 2: Run the Windows Update Troubleshooter

The built-in troubleshooter is not glamorous, but it can reset broken registry values and detect stopped services.

1. Open Settings.
2. Go to System > Troubleshoot > Other troubleshooters.
3. Find Windows Update.
4. Click Run.
5. Apply any suggested fix, then restart.

Try KB5073455 again. If it still fails, move to the manual repair steps below.

Step 3: Repair Windows System Files

Open Terminal or Command Prompt as administrator. Run these commands one at a time:

DISM /Online /Cleanup-Image /ScanHealth

DISM /Online /Cleanup-Image /RestoreHealth

sfc /scannow

DISM checks the Windows component store. SFC checks protected system files. If SFC says it fixed files, restart before trying the update again.

If DISM gets stuck at a percentage for several minutes, wait. It can sit at 62.3% or 84.9% and still be working. It drives me crazy that the progress display looks frozen, but closing it too early can make the repair fail.

Step 4: Reset Windows Update Components

This is the big one. It clears old downloads and forces Windows to fetch clean update files.

Open Command Prompt as administrator, then run:

net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver

Now rename the update cache 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. Then return to Settings > Windows Update and check again.

Step 5: Install KB5073455 Manually

If Windows Update keeps failing during download, install the package manually. Search for the KB number in the [source: Microsoft Update Catalog]. Download the package that matches your system type, usually x64 for most Windows 11 PCs.

To check your system type:

1. Open Settings.
2. Go to System > About.
3. Check System type.

After downloading the .msu file, double-click it and follow the prompts. Restart when asked. If the manual installer says the update is not applicable, you may already have a newer cumulative update, the wrong edition, or the wrong architecture.

Step 6: Match the Error Code to the Cause

Use the error code to avoid guessing:

• 0x800f081f: Windows cannot find required source files. Run DISM, then try manual install.
• 0x80073712: Component store corruption. Run DISM and SFC, then reset update folders.
• 0x80070002: Missing or mismatched update files. Clear SoftwareDistribution.
• 0x800f0922: Often linked to recovery partition size, VPN, or servicing connection issues.
• 0x80248007: Update metadata or download database problem. Reset Windows Update components.

For 0x800f0922, also check whether you use a VPN, proxy, or strict firewall. Turn them off briefly and retry. If the update fails near the end, inspect the recovery partition. Some servicing updates need enough recovery space to update Windows Recovery Environment.

Step 7: Check Update History and Logs

Go to Settings > Windows Update > Update history. Look for KB5073455 and check the failure code. Then open Event Viewer and check:

• Windows Logs > Setup
• Windows Logs > System
• Applications and Services Logs > Microsoft > Windows > WindowsUpdateClient

You can also generate a readable Windows Update log in PowerShell:

Get-WindowsUpdateLog

This creates a log on your desktop. Search inside it for KB5073455, error, and the code shown in Settings.

Step 8: Use an In-Place Repair Upgrade

If every update fails, not just KB5073455, the Windows installation may be damaged. An in-place repair upgrade keeps your apps and files while replacing Windows system files.

1. Download the Windows 11 ISO from Microsoft.
2. Right-click the ISO and choose Mount.
3. Run setup.exe.
4. Choose Keep personal files and apps.
5. Finish setup, then run Windows Update again.

Back up important files first. The process is usually safe, but no repair job deserves blind trust.

When to Wait Instead of Fixing More

If KB5073455 is new, Microsoft may pause or replace it after reports of install failures. Check the Windows release health page before spending hours on fixes [source: Microsoft]. If many users report the same failure on similar hardware, waiting for the next cumulative update may be smarter.

Still, do not ignore repeated failures for months. A PC that cannot install cumulative updates may miss security fixes. If the steps above fail, export your logs, note the error code, and contact Microsoft support or your device maker. Include your Windows version, build number, free disk space, and whether the failure happens during download, install, restart, or rollback.

Best fix order: restart, free disk space, run troubleshooter, use DISM and SFC, reset update components, install manually, then try an in-place repair upgrade. That sequence solves most repeated KB5073455 installation failures without wiping the PC.