A ghost on my computer

A mother of three wanting to surf the net, I would sit down at my computer to find that my mouse was moving and opening up window boxes and then closing them. My dos opened a few times and then some typing was going on, but it was really fast and as soon as I would move the mouse around myself- all my opened windows would begin to close. It really scared me, until I realized that it was no ghost. I was even more freaked out to learn it was some jerk that hacked into my computer over and over again for months!!!! I changed my windows password several times, and I put up messages on forum sites hoping to find the problem, but it did not stop him/them.
I finally opened up a word doc and said "LEAVE ME ALONE" it slowed things down a little, but especially at night is when the activity would start up again. Then it hit me, I felt like an idiot! I found out that they were getting through with my VNC for the last 5 months..
I guess I had it open to the whole world that whole time. So if you have this program and you are not using it- get rid of it.
Anna@gigp.com