Please help? I want to install a new expansion Game. The last time I did this I lost all cutom content. I don't want to have to reinstall all of it again or go to the ebsites and try to find it again. Luckily most of it was free. Please give me a detailed guide as to how to installmy new game and keep my custom content intact. I am 'slow' in understanding so for my sake please be specific. Talk to me like I'm a baby , no harm, no foul. Thank you!!