Windows 11

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What is Error 0x80070306 in Windows 11?

The error code 0x80070306 in Windows 11 typically occurs when the system fails to install a Windows Update. This issue may be caused by corrupted system files, software conflicts, or issues within the Windows Update components. It commonly affects major feature updates or cumulative patches.

Why Does Error 0x80070306 Happen?

  1. Corrupted or missing system files
  2. Outdated or incompatible drivers
  3. Conflicts with antivirus or firewall software
  4. Damaged Windows Update components
  5. Interrupted or improperly completed updates

Step-by-Step Fixes for Error 0x80070306

1. Use the Built-in Windows Update Troubleshooter

  • Navigate to: Settings > System > Troubleshoot > Other troubleshooters
  • Click Run next to Windows Update
  • Follow the recommended steps

✅ 2. Reset Windows Update Components

Open Command Prompt as Administrator, then enter:

net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
ren C:\Windows\System32\catroot2 Catroot2.old
net start wuauserv
net start cryptSvc
net start bits
net start msiserver

🔄 Restart your PC and retry the update.

✅ 3. Repair System Files Using SFC & DISM

In the Command Prompt (Admin), run:

sfc /scannow

Followed by:

DISM /Online /Cleanup-Image /RestoreHealth

🔁 Restart once done.

✅ 4. Temporarily Disable Antivirus Software

Turn off any third-party antivirus/firewall tools temporarily. These can block update processes. Be sure to re-enable them after the update.

✅ 5. Perform a Clean Boot

  1. Press Win + R, type msconfig, press Enter
  2. In the Services tab, check Hide all Microsoft services and click Disable all
  3. Go to Startup tab > Open Task Manager > Disable all startup apps
  4. Restart your computer and attempt the update

Downgrading from a newer version of Windows to Windows 10 involves a few steps, and it’s important to note that the process may result in data loss. Before you start, it’s advisable to back up your important files to ensure you don’t lose any valuable data during the downgrade. Additionally, make sure you have a Windows 10 installation media (USB or DVD) available, as you’ll need it for the downgrade. Here’s a step-by-step guide:

Download Windows 10

How to Downgrade to Windows 10:

Step 1: Back Up Your Data

Before proceeding with the downgrade, back up all your important files to an external drive or cloud storage to prevent data loss.

Step 2: Create a Windows 10 Installation Media

  1. Visit the Microsoft Windows 10 Download Page.
  2. Click on “Download tool now” to download the Media Creation Tool.
  3. Run the tool and select “Create installation media for another PC.”
  4. Follow the on-screen instructions to create a bootable USB drive or burn a DVD.

Step 3: Boot from the Windows 10 Installation Media

  1. Insert the USB drive or DVD with the Windows 10 installation media into your computer.
  2. Restart your computer.
  3. Press the necessary key to enter the boot menu (usually F2, F10, F12, or Esc depending on your computer’s manufacturer).
  4. Select the USB drive or DVD from the boot menu to boot from the installation media.

Step 4: Begin the Windows 10 Installation Process

  1. On the Windows 10 setup screen, select your language, time, and keyboard input preferences.
  2. Click “Next” and then select “Install Now.”
  3. Enter your Windows 10 product key if prompted.
  4. Accept the license terms and click “Next.”

Step 5: Choose Custom Installation (Advanced)

  1. When prompted to choose an installation type, select “Custom: Install Windows only (advanced).”
  2. Please indicate the partition where you have installed your current Windows version.
  3. Select the partition and click “Next.”

Step 6: Complete the Installation

  1. The installation process will begin. This may take some time.
  2. Follow the on-screen instructions to set up Windows 10, including creating a new user account.
  3. Once the installation is complete, you will have successfully downgraded to Windows 10.

Step 7: Restore Your Backed-Up Files

After the downgrade, restore your backed-up files to your new Windows 10 environment.

Keep in mind that downgrading may result in the loss of installed applications and settings from the newer version of Windows. Ensure you have the necessary product keys and installation media for any third-party applications you wish to reinstall. Additionally, it’s recommended to check for driver updates for your hardware components after the downgrade to ensure optimal compatibility.