If I was going to go that route I might as well have restarted the clock and simply re-installed the existing version
Given that I was thinking about being vaguely legal I decide the upgrade was probably worth it.
I was also working under the apparently false hope that Symantec would have got their act together and sorted the new version so that it ran better with XP user level accounts
It has this nice "feature" - install software under the admin account (because you have to), tell it to do automatic live updates and then log off and use your "normal" working account with basic user privilege. Last time I tried this the automatic updates didn't work
I have had to manually set the access on all the directories and registry keys it uses so that it works which rather defeats the point of using a user account instead of an admin account!