Keyboard curser bounces around

Question

I bought my acer laptop new about a month ago. From day one, I have been so frustrated when I type! My curser jumps backwords, will land in the middle of another word, or completely disappear. I spent this much time because I thought maybe it was a setting, because I was unfamiliar with Vista, or because I had put in Open Office, and maybe there was a conflict. But now, after trying to find some sort of logic to what makes it go where when, I am sure something is broken! It happens in my email, anywhere. It's actually an Acer 5720-4126