I've just set up a Mac Mini 1.66Ghz with OSX 10.4.5 for my folks. However, when I tried to double click folders on the desktop it wouldn't allow me to open them without going into the finder via the dock. I realised this was probably some setting in the system preferences, anyway in the mouse setting I inadvertentley switched it to a right click button (the mouse is an old tracking one with one button) and now I can't get the thing to switch back. I'm looking at the settings on my G5 running10.4.7 and I don't even get the option of changing the button? Any help would be greatly appreciated.