I suspect that "Mick Murphy" meant for you to uninstall Norton and never
reinstall it. It seems that Norton AV has a bad reputation for many
reasons. I don't use it, so can't comment much. I have used Symantec's
corporate AV product, and it wasn't too bad.
AV programs usually try to protect system files against changes (one
common virus activity). A system restore may be changing system files
when restoring (by replacing them with a older copy), and some AV
programs may interpret this as viruslike behaviour. For similar reasons,
some software installer programs recommend disabling AV while installing
(not necessarily good advice, unless you are confident that the installer
is not infected with a virus).
Disabling your AV should be sufficient - if that is actually what is
causing your problems.