someone to invade your pc, that is unless you don't care about it at all. You might not have any information of value to anyone whatsoever, but there is always someone who might just want to crash it for the hell of it.
There is no "someone"... intrusions are automated and forgotten about. People only reap the rewards. It would be very rare to actually see a human being involved in an intrusion. Go get smacked with a clue.