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! This also worked a charm for me, Thank you Shakusky

Thank you, this also helped me, it works OK.

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! This also worked a charm for me, Thank you Shakusky

Thanks! Works for me too, instant!

It seems that this error in the KB5007651 is reported differently in my Event Viewer.

Whilst the error listed in the Windows Update failure is 0x80070643, when I look at the Event Viewer errors, the source is shown as

Event 20, WindowsUpdateClient, and the error in the General description is given as:-

"Installation Failure Windows failed to install the following update with error 0x8024200B: Update to Windows Security Platform - KB5007651 (Version 1.0.2109.27002)".

Which is it? More to the point, what's the cause, and what's the fix?

Since you have Kaspersky active, The options for windows security are not shown. Turn off Kaspersky (Entirely). Then Follow these steps:

1. Search "Windows Security" in Start. Open it.
2. Click on "Virus & Threat Protection".
3. Under Virus & threat protection settings, click "Manage Settings".
4. Turn off Real Time Protection.
5. Go to Windows Update & retry the buggy update.

I am experiencing identical problems in installing this KB5007651 update on W11 Home, ASUS 64-bit laptop.

I've tried all the usual stuff (DISM, SFC, troubleshooter, resetting downloads etc.) but none of that works. I can, however, hide the update,

for the time being.

I note with interest the "Windows Security" suggestions. I'm running Bitdefender on the ASUS, and when I go to Settings>Privacy and Security>Windows Security and "Open Windows Security", I get the "You'll need a new app to open this windowsdefender link" message, and "Look for an app in the Microsoft store". Look there, and there ain't no such app.

Of course, on my W10 Pro desktop machine, also running Bitdefender, Windows Security shows me Protection Areas and Security at a Glance i.e. it works properly. Another reason not to go anywhere near the flawed, untested and useless W11 on my W10 desktop, and a source of regret that I allowed it on my laptop.

My laptop is a "production machine" with real data and applications (non-Microsoft) on it, and if anyone comes up with the suggestion to reinstall W11 on it and lose my apps, I shall be really annoyed. As usual, the silence from Microsoft is deafening.