Windows updates are meant to keep your system secure and stable — but sometimes they just refuse to install. One of the most recent examples is the KB5070773 update for Windows 11. Many users have reported getting stuck with endless retries, incomplete installations, or failed updates.

If your computer is unable to install this particular update, don’t worry. In this detailed step-by-step guide, we’ll go through every working solution to fix it. From restarting update services to manually installing the patch via Microsoft Update Catalog, you’ll learn all possible methods to get KB5070773 successfully installed.

Let’s begin with some basic troubleshooting and move step by step toward advanced fixes.

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1️⃣ Pause and Restart the Update

Let’s start with a quick refresh of the Windows Update process. Often, a simple pause and resume can trigger Windows to recheck and re-download the files correctly.

Steps:

1. Open Settings → Windows Update.
2. If you see a Retry button, click it first to check if the update can continue.
3. If retry fails, click Pause Updates.
4. Wait 10–15 seconds, then click Resume Updates.

This clears temporary update queues and reinitializes the update process. Once resumed, Windows will check again for available patches, including KB5070773. Let it download and install normally.

If the update still fails, don’t panic — let’s move to the next method.

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2️⃣ Restart Essential Windows Update Services

Windows relies on several background services to install updates correctly. If any of these stop or crash, the update can’t complete.

Step-by-Step Process:

1. Press Windows + R, type services.msc, and press Enter.
2. In the list, locate and double-click each of the following services:
   • App Readiness
   • Windows Update
   • Background Intelligent Transfer Service (BITS)

For each service:

• Set Startup type to Automatic.
• Click Apply → Start → OK.
• Then right-click again and choose Restart.

Restarting these services resets the Windows Update framework, allowing it to reconnect properly to Microsoft’s servers.

After restarting, go back to Settings → Windows Update and try installing KB5070773 again.

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3️⃣ Run System Scans Using Command Prompt

If the update still won’t install, corrupted system files might be the culprit. Running a few built-in Windows scan commands can repair them automatically.

Steps:

1. Type cmd in the Windows search bar.
2. Right-click Command Prompt → Run as administrator.
3. In the Command Prompt window, execute these commands one by one: sfc /scannow This System File Checker (SFC) scan will verify and repair missing or damaged files.
4. Once it finishes, run the next command: DISM /Online /Cleanup-Image /CheckHealth
5. When complete, run: DISM /Online /Cleanup-Image /RestoreHealth

Each of these scans will take time — sometimes 15 to 30 minutes depending on system speed. Once all scans are complete, restart your computer.

After rebooting, open Settings → Windows Update, and try installing KB5070773 again.

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4️⃣ Download and Install KB5070773 Manually via Microsoft Update Catalog

If the update repeatedly fails through automatic updates, you can install it manually from Microsoft’s official database.

Step 1: Identify Your System Version

Before downloading, you need to confirm two details:

• Your Windows 11 version (24H2 or 25H2)
• Whether your system is 64-bit or ARM64

To check:

1. Press Windows + R, type winver, and hit Enter.
   • You’ll see something like Windows 11 Version 25H2.
2. Go to Settings → System → About.
3. Under Device specifications, note System type (e.g., “64-bit operating system”).

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Step 2: Visit Microsoft Update Catalog

Now that you know your system type:

• Go to 🔗 Microsoft Update Catalog
• In the search bar, type KB5070773 and press Enter.
• You’ll see multiple entries depending on Windows versions and architectures.

For example:

• Windows 11 Version 25H2 x64-based Systems
• Windows 11 Version 24H2 x64-based Systems

Click Download next to the one that matches your system.

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Step 3: Install the Update Manually

Once downloaded:

1. Open the .msu file from your Downloads folder.
2. Follow the on-screen prompts to install.
3. When finished, restart your computer.

This method bypasses update errors caused by Windows Update or Store components, ensuring the patch installs directly.

If it still doesn’t install, let’s repair the update mechanism itself.

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5️⃣ Repair Windows Using “Fix Problems Using Windows Update”

Windows 11 introduced a built-in repair option that reinstalls core system components while keeping your personal files and apps intact. This is a safe and powerful way to fix persistent update failures.

How to Use It:

1. Open Settings → System → Recovery.
2. Under Recovery options, find Fix problems using Windows Update.
3. Click Reinstall Now.

Windows will then reinstall the latest version of your OS (e.g., 25H2) while keeping everything else untouched.

This process takes a while — sometimes an hour or more — depending on your internet speed and storage performance. Once it completes, restart your system and check again for the KB5070773 update.

If the update still refuses to install after this repair, the final method below will resolve even the most stubborn issues.

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6️⃣ Use the Media Creation Tool to Update Windows

This is the ultimate fix for any Windows update issue, including KB5070773. The Media Creation Tool performs an in-place upgrade — refreshing your Windows installation without erasing your files.

Step 1: Download the Tool

Visit the official Microsoft website:
🔗 Download Windows 11 Installation Media

Scroll down until you find Create Windows 11 Installation Media, and click Download Now.

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Step 2: Run the Tool

1. Open the downloaded file (MediaCreationToolW11.exe).
2. Accept the license terms.
3. Choose Upgrade this PC now → click Next.
4. The tool will automatically detect your Windows edition.

Select ISO file, then click Next.
Save the ISO file on your desktop and let the download complete (this may take 30–60 minutes).

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Step 3: Install Windows from the ISO

Once the ISO is ready:

1. Double-click the ISO file to mount it as a virtual drive.
2. Open it and double-click Setup.exe.
3. When prompted, select Keep personal files and apps.
4. Click Install and let the process complete.

Your system will restart several times. Once finished, your Windows version will be updated and all pending patches, including KB5070773, should install automatically.

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💬 Frequently Asked Questions (FAQ)

Q1. What is KB5070773 for?
It’s a cumulative update for Windows 11 (versions 24H2 and 25H2) that includes security patches, performance improvements, and bug fixes.

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Q2. Why does Windows fail to install some updates?
Common reasons include corrupted update caches, missing system files, outdated services, or mismatched configurations between Microsoft Store and Windows Update components.

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Q3. Can I skip installing KB5070773?
Technically, yes, but it’s not recommended. Security and stability updates like this one often include fixes for vulnerabilities and compatibility improvements.

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Q4. How long does the Media Creation Tool process take?
The download and upgrade together usually take between 45–90 minutes depending on system speed and internet connection.

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Q5. Will I lose my files using the reinstall or media creation method?
No. As long as you select the option to keep personal files and apps, your data remains safe.

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🏁 Final Thoughts

We’ve now walked through every reliable fix to resolve KB5070773 update installation errors on Windows 11. From simple service restarts to manually applying the patch, each step progressively addresses deeper system-level issues.

If you followed all the methods in this article, your system should now be fully updated and stable. Remember, regular updates not only bring new features but also protect your PC against emerging security threats.

And here’s a small tip — after successfully installing this update, restart your PC twice to ensure all components are properly configured. It may sound unnecessary, but it helps finalize registry and driver updates.

So, go ahead — apply these steps, update your Windows, and enjoy a smoother, faster system.

#Windows11 #KB5070773 #WindowsUpdate #MicrosoftFix #PCRepair #TechGuide #CumulativeUpdate #Troubleshooting

Emily Carter

Emily is a Windows power user and technical writer from the UK. She has spent 7+ years in IT consulting, helping businesses migrate to new Windows versions, optimize performance, and solve common errors. Emily’s articles combine professional experience with step-by-step clarity, making even registry hacks accessible to everyday users.

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