Haha, yeah that makes sense. I guess I meant SC4 + RH. Well, the whole point was I was hoping to be able to just install the plain one I bought. I found it pretty cheap and was hoping I wouldn't have to go back and buy SC4 Deluxe. Mostly I just don't know what the error message means. It's seems as though the patches I downloaded when I previously borrowed SC4 deluxe are interfering with SC4 plain that I just bought, even though I uninstalled it. I'm just not really sure how I would go about fixing it. Like I said, I'm mediocre at best with computers but, D@mn! do I love playing Sim City.