Hi, I just got a magic trackpad and I have it hooked up to my computer, but I can't open up the preferences. I have OS X 10.6.4 and I can find "Trackpad" in my search bar, but when I click on it, it says "You can't open the 'Trackpad' preferences pane because it is not available to you at this time". And then under that it says I may need to attach a device to my computer. Any suggestions on how to fix this? I am getting really frustrated.