How to Fix Windows Defender Update Failure with an Error Code 0x80070643?


Issue: How to Fix Windows Defender Update Failure with an Error Code 0x80070643?

Windows Defender update (KB2267602) fails to install due to the error 0x80070643. Does anyone know why this error shows up and how to fix it? Thanks!

Solved Answer

Along with Windows 10 Anniversary Update, Microsoft has released the update for Windows Defender, which is known as KB2267602 update. Tens of thousands of Windows 10 fans have already expressed their concern about Windows Defender’s update failure due to the 0x80070643 error. Although the download of the update is executed successfully, the error pop-ups unexpectedly and prevents the update from installing completely. Even though this issue is plaguing people for more than a year already, Microsoft hasn’t confirmed it and did not release a patch or official fixes. Consequently, there is no surprise that thousands of people are discussing about this issue on the official Microsoft’s forum and looking for the ways to solve it by themselves. It has been noticed, that 0x80070643 error tends to show up when some undeleted files of the previous anti-virus are lurking on the system or when there are some corrupted files on the registries. After a close investigation of people’s reports regarding 0x80070643 bug and its solution, we have excluded several methods that helped the majority of Windows Defender users to run KB2267602 update.

How to fix 0x80070643 error when trying to update Windows Defender?

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Method 1.

As you probably already know, two antivirus can hardly operate on the system at the same time. Each security tool consists of multiple files, which are installed in various system locations. Therefore, if one antivirus is not uninstalled properly, installation of the other might fail or bring system errors. Windows Defender update error 0x80070643 is not an exception. Therefore, if you have been running another anti-virus, check for its leftovers. For this purpose, you should use a specific antivirus removal tool, which should be accessible on the official website of the software that you used to use.

Method 2.

Another Windows Defender 0x80070643 error cause may be related to the system files, which might have been deleted accidentally, corrupted by some third-party software or misplaced. Therefore, to check system files, perform these simple steps:

  • Right-click on Win key to open menu bar and select Command Prompt (Admin).
  • Type sfc /scannow command and press Enter.
  • Now the system should automatically scan and fix all issues related to system files.

Method 3.

You should also try to clean boot your PC in case there are some conflicting programs. For that, do the following:

  • Open search, type System Configuration, and press Enter.
  • Go to the Services, select Hide all Microsoft services and then Disable all.
  • Then navigate to Startup tab and select Task Manager.
  • Here you have to select all items and click Disable.
  • After that, close Task Manager and click Ok on the System Configuration dialogue box.
  • Finally, restart your PC and try to run Windows Defender update KB2267602.

Method 4.

Last, but not least, we would highly recommend scanning your PC with a professional program , such as ReimageMac Washing Machine X9 to check if your system is not affected by malware, if registries are ok, if there are no software incompatibilities, missing updates, and similar issues that may also trigger 0x80070643 error.

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About the author
Linas Kiguolis
Linas Kiguolis - IT professional

Linas Kiguolis is a qualified IT expert that loves sharing his excellent knowledge about problems in Windows and Mac operating systems. Linas’ insights often help other team members find quick solutions for visitors of UGetFix site.

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