I'm from the UK, and a mac user. (Leopard 10.5.7) I've installed the game and when I get to the part to pick a town the following message pops up: Disc Authorization Failure We are unable to verify that your disc is a valid copy of The Sims 3. Please contact customer services. I have to accept the following message, and when I do the game quits itself. I was really looking forward to playing it too I bought The Sims from the GAME store last week, and today I swapped the disc for a new one in store in case there was a problem with the disc itself. I've tried all the FAQ on the sims 3 site, and they're no help.