KB5043080 Not Installing on Windows 11 – Fix

If Windows 11 KB5043080 fails to install, you are not alone. This issue is commonly caused by corrupted system files, broken Windows Update services, or update cache problems. Below are step-by-step fixes, starting from the safest and moving to more advanced solutions.

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Step 1: Run System Repair Commands (DISM & SFC)

This fixes corrupted system files that often block Windows updates.

1. Type cmd in the Windows search box
2. Right-click Command Prompt and select Run as administrator
3. Click Yes to allow permission

Now run the commands one by one, waiting for each to complete 100% before moving to the next:

• First command → press Enter
• Second command → press Enter
• Third command → press Enter

Once all scans are complete, restart your computer and try installing the update again.

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Step 2: Retry the Update

1. Open Settings
2. Go to Windows Update
3. If you see a Retry button, click it and wait

If the update fails again, continue to the next step.

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Step 3: Pause and Resume Windows Update

This refreshes the update process.

1. Go to Settings → Windows Update
2. Click Pause updates
3. Wait a few seconds
4. Click Resume updates
5. Check for updates again

Still not installing? Move on.

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Step 4: Restart Required Windows Services

Windows Update depends on several background services. If even one is broken, updates fail.

1. Type Services in Windows search
2. Open Services

Now configure the following services:

Windows Update

• Double-click Windows Update
• Set Startup type to Automatic
• Click Apply
• Click Start (if available)
• Click OK
• Right-click it and select Restart

Background Intelligent Transfer Service (BITS)

• Double-click BITS
• Set Startup type to Automatic
• Click Apply
• Click Start
• Click OK
• Right-click and Restart

App Readiness

• Double-click App Readiness
• Set Startup type to Automatic
• Click Apply
• Click Start
• Click OK
• Right-click and Restart

Restart your PC and check for the update again.

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Step 5: Install KB5043080 Manually (Microsoft Update Catalog)

If Windows Update keeps failing, manual installation is often the fastest fix.

1. Open the Microsoft Update Catalog (link provided in the video description)
2. Search for KB5043080
3. Press Win + R, type winver, and check your Windows version
4. Go to Settings → System → About
5. Check your System type (x64 or ARM)

Download the version that exactly matches your Windows version (for example: Windows 11 25H2 x64).

1. Click Download
2. Open the downloaded .msu file
3. Follow on-screen instructions
4. Restart your PC

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Step 6: Use “Fix Problems Using Windows Update”

This reinstalls Windows without deleting apps or files.

1. Open Settings
2. Go to Windows Update
3. Click Advanced options
4. Open Recovery
5. Select Fix problems using Windows Update
6. Click Reinstall

This process takes time. Once finished, restart your PC and try installing the update again.

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Step 7: Last Resort – Media Creation Tool (In-Place Upgrade)

If nothing else works, this method guarantees the update installs.

1. Open Microsoft’s official website
2. Download the Windows 11 Media Creation Tool
3. Run the .exe file
4. Click Accept
5. Choose ISO file
6. Save it to your desktop
7. After download completes, open the ISO
8. Double-click setup.exe
9. Click Yes, then Next
10. Accept the license terms
11. Make sure Keep personal files and apps is checked
12. Click Install

This performs a clean repair install without data loss.

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Conclusion:

If KB5043080 still fails after Step 7, your system has deeper corruption or hardware-level issues. At that point, a full clean install is the only guaranteed fix.