So Mad

It has seemed after I had downloaded the Demo for Sims 3 Pets, it had messed up all my CC in my launcher, it had all been unstalled, and when I tried to install it back it would say succeed then I would load up my game it would not be in there, then I tried to replace my back up with the sims 3 folder and tried it again, nope still no luck so I unstalled my games and tried it again, It did the same thing. I did not spend all that money on these Damn games to be spending most of my time trying to fix it then getting to play it. I Googled to try to find some help, but I really can't find any, so if you have any idea how to fix this or you have downloaded The Sims 3 Pets Demo and this has happen to you leave a comment.