How Can I Stop People Seeing Who Ive Added As A Friend Help! I Have A Creepy Hacker!!?

Help! i have a creepy hacker!!? - how can i stop people seeing who ive added as a friend

I was on msn a while ago and said to my people forever. My friend told me in an interview that he 2 of my other friends there. if we are 4 people talking, including me.
We chatted a little, and then someone began to write for me. as if it was like my name and everything, but I have not written.
It was really weird and at first I thought it was one of my friends then something stupid in a way, but gone.
if this person talking about me and my friends on my account. Could still write, and all of them.
I have my name and source of ANF while with my friends couldnt the difference between me and the hacker.
The only good thing to say to the Fund if your msn convoblahblah's letter "is a message" and if I did not write to tell the hackers.
They had myspace on my own. and said they read all my comments and everything.
has not changed that one of my key, but he knows he can.
It was also really scared because they were talking about how good my house. asked and, as it seemed, and describes some of the things about him and it felt good. AHHH fear.
obvisouly someone should be, I know.
Please help me in asking to be what they used for that purpose?
He could not even login to MSN and MySpace, when they were lit.
and its almost as if I could see my screen, as if everything I saw.
I've changed my passwords and everything.
Sorry, that was so long, but cogenst please help, because I find it very scary you know where I live.
As they have done and what can I do to prevent this, follow in the future be?
Thank you.