Hmmm, so I was going through some old files and getting rid of what I didn't need, and I came across a file w/ unknown ownership, and it wasn't letting me take ownership even though I'm the admin. So I figured "hey... I'll go into safe mode and get rid of it". Well when I went into Safe mode it was gone, so I decided to boot up normally and see if it would reappear. Well, it isn't there, and search isn't coming up with anything. Everything else is fine, but I've never come across a file that vanished before... it strikes me as kind of strange.
Is this a sign of things to come or anything? Could it be a possible threat?
EDIT: I probably should've googled this first, so if I'm just being stupid I apologize