My brother believes his computer has been hacked and is going to all lengths to find out how. He believes this is the case as someone seems to have access to his emails. Even when he changes emails, his account settings, passwords etc, they still seem to know what has been written. I'm not asking how to hack (before anyone asks), but to know how to detect if it is happening. He has heard of places to take the computer for analysis. I think he's over reacting. But, he's convinced. Any help appreciated.