Turn your machine on so the blue DVD screen is showing, open the drawer, keep the drawer open and with the remote, type 89260, the 0 on the end keeps the machine in `free region` mode, so you can play any disc from around the world without having to change it everytime. It works too, `cause thats what I have mine set at. As far as I am aware Macrovision should be disabled by doing this.
Have fun.