PLEASE HELP!!!!! I bought The Sims 3 Plus Pets. I put it in my CD drive and the installation process popped up, entering the code and everything loading. But it only installed The Sims 3, not my Pets expansion. I have the code for it obviously because it came with the other code. But I don't know how to go about installing the pets expansion. So please help! I don't know how to do this and I don't wanna waste my money.