I found a backdoor trojan on my computer and I suspect my friend’s ex-girlfriend (she wasn’t ever even really his “girlfriend” anyway, lol). She and her friend have already hacked his Myspace account (and changed all his login info and refused to give it back to me. he is really mad about it too!) which I was looking after for him with his permission as per his own request, so I know they may have knowledge of how to do this. He says she is obsessed with him and from things she’s said to me, I believe him, so her attacking and spying on my computer isn’t something I would put past her (she showed me a picture of him thru MSN messenger, which now that I think of it, was rather odd to do, so it seems suspicious), but I’m not sure if it’s her that did it, or if she did, if it was by accident, or even if one of my friends sent it to me by accident with pictures they sent (if that can happen?), because I never received anything specifically like what you described “hey, view my new summer pictures”, etc.