Hi msanig,
<EDIT> It just occurred to me, you are on 8.1 - let us know if you run into any difference between 8.1 and these instructions - they do work on Win 7.
Thanks for the info. I am concerned about the NRnRT not running to completion by not reinstalling the program. At this piont I feel the following may be worth a try.
Please open Run by pressing windows key + R -> devmgmt.msc -> View Show
Hidden devices -> open Non-Plug and Play Drivers-> Maximize the Screen
If you have Identity Safe data Export it ->
Go to Control panel uninstall N360 ->select the second option to
completely uninstall ->restart -> Run Norton Removal Tool -> Restart ->
Go to the maximized page -> if you find NAVENG, NAVEX15, Norton Antivirus settings manager, starting from Symantec
Data Store to SymEvent (entries starting with Sym) ->right click on them
click uninstall -> For the Restart prompts select no -> Go to Program files
if you find Norton Folder delete it -> Go to Run ->type temp ->Delete all
the files in there -> Run -> %temp% ->delete all ->Now Restart the PC -
>Install the version of N 360 you use:
http://norton.com/latestn360 (Standard Edition)
or
http://norton.com/latestn360p (Premier Edition)
->Run Live Update until you get "no updates found" message ->restart PC
Let us know how it went for you.