Hi,Awydd. Usually it's a temporary server thing, but you can download the full definitions set if you want to, using the Intelligent Updater option.
Also, if you're running Win 10, you need to do a full restart for Norton to correctly operate/update.
If these suggestions don't work, a reinstall using the Norton Remove and Reinstall Tool will give you a fresh copy.
If used, after the reinstall run Live Update manually restarting if requested until no more are found, and then restart again.
Let us know how you go. @Awydd
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