How to fix
KB2267602 fails to install
on Windows

Hello. I tried to install the Security Intelligence Update for Microsoft Defender Antivirus - KB2267602 (Version 1.387.507.0) but I received the 0x80070643 error. What should I do?

Microsoft released KB2267602[ref en-1] as a security update for its Defender Antivirus software, which helps protect Windows 10 computers from malware and other security threats. However, some users have reported having problems installing this update, specifically receiving error code 0x80070643.

Windows updates are critical for maintaining the operating system's security and stability. These updates contain critical security patches, bug fixes, and performance improvements that can help protect users from known security vulnerabilities while also keeping their systems running smoothly.

If KB2267602 fails to install, users' systems may be vulnerable to security threats because the update contains critical Defender Antivirus security fixes. Furthermore, some users may encounter performance issues or other issues with their systems as a result of not having the most recent updates installed.

Restarting the computer, running the Windows Update troubleshooter, and manually downloading and installing the update from the Microsoft Update Catalog are all options for resolving issues with KB2267602 failing to install.

In this guide, you will find 7 steps that should help you fix KB2267602 fails to install in Windows 10.  If you want to avoid a lengthy troubleshooting process, you can use a maintenance tool like [d1] that can fix most system errors, BSODs,[ref en-2] corrupted files, and registry[ref en-3] issues. Otherwise, follow the step-by-step instructions below.

Method 1. Run the Windows Update Troubleshooter

• Press the Windows + X keys and go to Settings
• Go to Update and Security
• Click Troubleshooter
• Select Additional troubleshooters

• Run the Update troubleshooter
• Restart

Method 2. Fix Corrupted System Files

Use Command Prompt commands to repair system file corruption:

• Open Command Prompt as administrator
• Use the following command and press Enter:
  sfc /scannow

• Reboot your system
• If SFC returned an error, then use the following command lines, pressing Enter after each:
  DISM /Online /Cleanup-Image /CheckHealth
  DISM /Online /Cleanup-Image /ScanHealth
  DISM /Online /Cleanup-Image /RestoreHealth

Method 3. Update Drivers

• In the search box on the taskbar, enter device manager, then select Device Manager
• Select a category to see the names of devices, then right-click the one you’d like to update
• Select Search automatically for updated driver software
• Select Update Driver

• If Windows doesn't find a new driver, you can try using an automatic tool like [rev id="DriverFix"] which can find the best drivers for your system

Method 4. Restart Windows Services

• Type services in the search bar and launch the Services utility
• Find Windows Update in the list
• Double-click on it, set the Startup type to Automatic, and click Apply
• Now click on Restart the Service

• Do the same with Background Intelligent Transfer Service

Method 5. Install the KB4577266 Update

KB4577266 is a Servicing Stack Update for Windows 10. If for some reason your system does not have it, you should download and install it to see if it fixes the issue.

• Open your browser and go to the Microsoft Update Catalog.

• You will be presented with several versions of the KB4577266 update.
• Find the correct update for your OS version (you can check it by right-clicking Start and picking System > Windows specifications > Version is what you are looking for) and click Download.
• Follow the on-screen instructions and install the update.
• Reboot your system.

Method 6. Try Clean Boot

• Open the Search menu, type in system configuration, and press Enter
• Under the Services tab, tick the Hide all Microsoft services box
• Click on Disable all button
• Head over to the Startup tab and click on Open Task Manager
• Select a third-party program and click on Disable at the top

• Repeat this step to disable all third-party apps and programs
• Restart your PC to enter the clean boot state and see if the issue persists
• If the issue disappeared in the clean boot state, then you can be certain that a third-party app is causing it
• Go through all recently installed apps or programs and remove them one by one

Method 7. Use Media Creation Tool

• Visit the official Microsoft website and download Windows 10 installation media.

• Double-click the installer and select Yes when UAC shows up.
• Agree to terms and click Next.
• Select Upgrade this PC now and select Next.
• Proceed with on-screen instructions.
• Your PC will restart.