Update for Windows Security platform - KB5007651 (Version 1.0.2109.27002)

Simply access the Windows Security app settings (right-click on Windows Security in the Start Menu). Once there, hit "Repair" and "Reset". Then, attempt the Windows update again. Worked for me!

I tried to contact microsoft but they didn't help because most of the stuff is out of s mode.

Hi,

Thanks for your post in Microsoft Community.

I understand that you are encountering a Windows Security Platform Update error with error code 0x80070643.

You can try running the command prompt as administrator and execute the following command:

(The command prompt can be found by searching for cmd in the search bar.)

sfc /scannow 



Dism /Online /Cleanup-Image /ScanHealth 



Dism /Online /Cleanup-Image /CheckHealth 



DISM /Online /Cleanup-image /RestoreHealth 

After the command is executed, restart the computer, and then execute the following command again:

sfc /scannow 

After detecting no problems with the system, try installing the Windows Security Platform Update again.

Please feel free to let me know how it goes.

Kirk | Microsoft Community Support Specialist

---

* Beware of scammers posting fake support numbers here.

* If your problem is not solved, you could reply to the post again and we would continue to provide technical support for you.

* Please check and vote this answer if it helps as it will be beneficial to more community members reading here.

it's still error after running all the commands.

You are genious. The only thing it worked! Thks