X & my dad

Around 2pm, my dad called me, and said that X is not coming at home PC. I asked him what it is showing?
He told me a full screen of reporting bug stuff (he knows only start & shutdown & simple clicking). I replied, sorry I can't say anything from here(I don't know anything about that , how can I say??).
But after half an hour he replied that X is ok now.
How he did that? & what actually happened? God knows!!