My Brother has the same computer as me and also has Norton. He has a older version of Norton 360 It's the one where the colour scheme is black instead of white.
We could opened it before and it was fine but now for some reason we can't open it. I told him to downoad MBAM Free on to the computer to check for viruses just to be on the safe side and everything came up clean. And before we downloaded the MBAM we were able to open the check security history option (We downloaded from the offical site so I don't think this is anything to do with it)
He also did a full system scan on the 8/05/2014 and it only turned up tracking cookies.
The computer was acting strange it wasn't loading into Windows 8.0 properly.
If you have any suggestions on what to do here please post!