Earlier tonight Norton appears to have closed itself or crashed without warning.
When I cannot say, only that it was running when I first got on the machine tonight at around 7:00, by the time I had noticed Norton was not running it was nearly 11:00pm.
During that time I was performing a few tasks on the pc (mostly searching for some files), looking at a few websites (all of which I trust, I:E I've never gotten a virus/attack blocked on them and have been using them everyday for years, but you can never tell) and I was connected to an online game server as well.
When I finally noticed norton was gone I immediately tried to reopen it but it came up with an error '8504 , 104'. Upon rebooting norton launched as normal.
Since you can never tell what has been going on when this happens (i:e has anyone got into the unprotected pc/installed nasty stuff, tampered with Norton? or just more normal viruses from website adverts) I am wondering how I should go about checking. I'm assuming a safe mode scan with Norton and Malwarebytes but I would welcome any other suggestions/opinions about how concerned I should be with regards what may have happened or not.
Thank you for any help or suggestions you can provide.