error code: 0x800B0003

I am trying to install Microsoft Security Essentials and I am getting an installation error.  error code: 0x800B0003. 

Any ideas on how to fix this.

Question Info

Last updated January 22, 2020 Views 38,033 Applies to:
The installation of MSE relies on Windows Update and this appears to be a Windows Update error: Perhaps something within that article may help.


What operating system?

Prior Security Software?

Any security software still installed?

A possible reason for this problem is that you have conflicting security software installed fully or partially on the PC. Remove all other security software from the PC.
You may need to use a cleanup tool to remove your prior security software:

If that fails to resolve the problem, open a support case:
To open an email support case, start here:


~ Microsoft MVP Windows Live ~ Windows Live OneCare| Live Mesh|MS Security Essentials Forums Moderator ~
Windows Insider MVP (Security), Moderator Microsoft Community

33 people were helped by this reply


Did this solve your problem?

Sorry this didn't help.

Great! Thanks for marking this as the answer.

How satisfied are you with this reply?

Thanks for your feedback, it helps us improve the site.

How satisfied are you with this response?

Thanks for your feedback.