It seems that my email has been hijacked. I keep getting my normal email, but I am also getting tons of "Delivery Status Notification" for email that I haven't sent. I assume that this means my email has been hijacked. Is this what is referred to as a "bot"? I'm using Norton Security Suite but nothing has been detected. I'm using Outlook Express as my email client and my operating system is Windows XP. I ran a Hijack This scan as attached. What can I do?