Very interesting information LegTwister, and good detective work! :smileywink:
It almost sounds like you went from NIS 2012 to N360 P without ever uninstalling NIS. I would normally recommend uninstall via the Control Panel, a run of the NRT (others may disagree with that action) and then the install of N 360 P followed with the run of LiveUpdate until "no updates found".
Did you notice the change in the look of the user interface on 2.17.14? I am curious if in fact N 360P was installed on that date or not - but there is a vast difference in the look of the two, so it should be noticeable.
Also, if you installed a "new/different" version or product, since most of the downloads are without definitions, then the large update would be explainable.
Now all that said - thigns are starting to loko normal - please keep an eye on it and hopefully all has worked itself out with the change over from NIS to N 360P.