Need help with the Sims 3 , Pets expansion pack ? :S

The first time I downloaded It I did have some trouble, however I un-installed it and tried again and it worked the second time. I then clicked on the Sims 3 Pets Icon on my desktop to get the game started and it loaded perfectly fine. When I got to the game menu, I was unable to load a previous town from the normal Sims 3, and so I tried selecting this town "Appoloosa" and making a new game with that city but that it wouldn't work either. I would press the Check mark button and nothing would happen. Any ideas? / This is my first expansion pack so bare with me lol. :newfag:

//MOVED
Hello,

Welcome to the Forum!
Do you have any Mods or Custom Content?

Hello,

And is your game up to date, and cracked with the fix?