you ran a LiveUpdate, but you been getting these failed error to complete messages.
There could be various reasons for which Norton 360 live update failure in your system.
you may get the Norton Web Protect Definitions Failed to complete.
you may get the Norton Power Eraser Failed to complete.
We need to check the policies and registry settings and exceptions and firewall settings and other kind of settings.
For a quick solution seek an expert's help from the following chat link.