All these things are controlled with the mouse setting software. There should be a program the comes with the mouse to (1) assign what function each button does like act as a generic middle mouse button. which is what I said in my original reply and (2) control things like sensitivity which controls the movement rate of the cursor which is the problem you are now having. I don't think you have to keep changing mice. You have to go into the control software for the mouse and set what the buttons do and the mouse sensitivity.Thanks Guys For all your help. Also I switch my mouse to a Belkin Mouse and it work, However it is much slower moving across the screen. Lets see if I can find my Mighty Mouse and see it that work. I will look into the documentation.
Thanks again to all of you.